Complete 1:1 Reps Sneaker Sizing Guide: The Expert Method to Never Get It Wrong Again (2026)

You click "Add to cart", you choose a size by feel, you pay. 10 days later, the package arrives, and the sneaker pinches your toes or floats around your heel. This is the most common mistake in the world of 1:1 reps, and it's also the most avoidable. This guide is the most comprehensive ever written on the subject in French: over 13,000 words, 27 sections, precise tables for each brand, and the exact methodology we use internally at ONLY REPS to advise hesitant customers. By the end of your reading, you'll be able to choose your size with your eyes closed, for any model from any brand.

Reading time: 45 minutes. Bookmark it – you'll come back to it with every order.

Why choosing your sneaker size has become so complicated

30 years ago, choosing your shoe size was simple: you went to the store, tried them on, bought them. Today, in 2026, the sneaker market has become a sprawling ecosystem where American, Japanese, Korean, and European brands intersect — each with its own standards, its own lasts (wooden forms used as molds), and its own labeling conventions.

The problem gets even more complicated when you order online, without being able to try them on. Size-related returns account for between 25 and 40% of returns on e-commerce sneaker sites, and it's the number one cost item for most e-retailers. At ONLY REPS, we've reduced this rate to less than 8% thanks to our educational approach — which is exactly what you'll learn in this guide.

The 4 fundamental reasons for the problem:

1. The absence of a global standard. No international authority forces manufacturers to adhere to a uniform sizing chart. Each brand makes its own conversion between foot length and size label.
2. The evolution of cuts. An Air Force 1 produced in 1985 doesn't fit exactly like an Air Force 1 produced in 2026, even if the label shows the same number. Lasts have been refined over the years.
3. The diversification of models within the same brand. At Nike, an Air Max 90, a Dunk Low, and a Vapormax fit differently, even though they have the same labels.
4. The influence of the Asian market. Korean and Japanese brands have sizing conventions based on centimeters (CN, JP), different from those used in Europe (EU) or the USA (US).

Add to that the fact that every foot is unique (length, width, instep height, arch), and you understand why a single number labeled on a box cannot be enough.

Good news: once you master the method we'll develop here, the problem disappears. You'll be able to choose your size with 95%+ accuracy for any brand, any model, in less than 30 seconds.

Foot anatomy: what you absolutely must understand

Before talking about measurements, we need to understand what we're measuring. The human foot is a complex structure of 26 bones, 33 joints, and over 100 muscles, tendons, and ligaments. For sneaker sizing, 5 dimensions really matter:

2.1 — Length

This is the main measurement, from the heel to the tip of the longest toe. Be careful: it's not always the big toe. About 30% of people have a second toe longer than the big toe (this is called a "Greek foot"). Length is measured standing, with body weight distributed over both feet, never sitting.

2.2 — Width

Measured at the widest part of the forefoot, just behind the toes. Width is expressed in letters in the USA (B = narrow, D = standard men's, E = wide, EE = extra-wide) but rarely indicated in Europe — this is why your foot might "not fit" even with the correct length.

2.3 — Instep height

This is the height between the ground and the top of your foot, just behind the toes. A high instep can make some low-cut sneakers uncomfortable (lacing pulls on the top). If you have a high instep, avoid very flat models like Stan Smiths or Vans Authentic.

2.4 — Arch

3 categories: high arch (pes cavus), medium arch (normal), low arch (flat feet). The arch influences the need for support: if you have a low arch, prioritize sneakers with good arch support (Asics Gel-Lyte for example, see our Asics collection).

2.5 — Overall shape

"Egyptian" foot (longest big toe, progressive decrease), "Greek" (longest second toe), "square" or "Roman" (toes roughly the same length). This shape determines whether you will be comfortable in pointed toe boxes (Egyptian) or rounded ones (square).

In 95% of cases, correctly measuring length and estimating width is enough. But if you have specific features (very wide foot, very high arch, marked asymmetry), you'll need to refine. We'll come back to this in sections 20 and 21.

The Brannock method: the complete professional measurement

The Brannock device is the professional instrument used in all good shoe stores since 1927. It is the gold standard for foot measurement, and it simultaneously measures length, width, and arch.

3.1 — How it works

The Brannock includes three measurements:

• Heel-to-toe length.
• Heel-to-ball length — the most important dimension.
• Width, expressed in AAA (extra-narrow) to EEEE (extra-wide).

Charles Brannock's revolutionary idea in 1925: the heel-to-ball length is more important than the total length, because this section determines the placement of the foot's natural pivot point in the shoe. If it's misaligned, you'll experience pain even with the "correct overall length."

3.2 — How to use it without owning one

Very few people have a Brannock at home (it costs €130). But you can go to a good shoe store, they all have one, and the measurement takes 2 minutes. Also ask for the measurement for your other foot — there's often a 2 to 5 mm difference between left and right.

If you don't have access to a Brannock, the home method described in section 4 gives you 95% accuracy, which is largely sufficient for choosing a sneaker.

3.3 — Brannock to EU conversion table

The reliable 5-minute home method

No need to go to a store. Here is the official ONLY REPS method, tested on thousands of customers, with an average accuracy of +/- 2 mm compared to a professional Brannock.

4.1 — Necessary equipment

• An A4 sheet of paper (or A3 if you're over 28 cm).
• A smooth wall.
• A pencil or pen.
• A rigid measuring tape or a ruler at least 30 cm long (not a flexible sewing tape measure).
• A pair of thin socks (the ones you usually wear with your sneakers).

4.2 — The step-by-step method

1. Place the sheet of paper on the floor, with the short edge against the wall. The sheet must be perfectly flat.
2. Put on your socks. Not barefoot: you always wear socks in your sneakers, so measure under the same conditions.
3. Place your foot on the paper, heel against the wall. Your foot should be perpendicular to the wall.
4. Stand up straight, with your body weight distributed over both feet (leaning on your other foot on the other side). This is crucial: when sitting, your foot is 5 to 8 mm shorter than when standing.
5. Ask someone to mark the tip of your longest toe with a pencil perfectly perpendicular to the floor. If you are alone, do it yourself very carefully.
6. Step back from the paper and measure with the tape measure the distance between the edge of the paper (which touched the wall) and the mark.
7. Note the measurement in cm with 1 mm precision (e.g., 26.7 cm).
8. Repeat the process for the other foot. Note the difference if it exists (often 2 to 5 mm).
9. Keep the longest measurement. This is your reference.

4.3 — Estimating width

For width, it's simpler: look at the shape of your forefoot. If the front of your foot (just behind the toes) extends significantly beyond your heel, you have a wide foot. Conversely, if your foot is narrow and slender, you have a narrow foot.

Quick test: place your foot on the paper and trace its entire outline. Measure the width at the widest point (just behind the toes).

International conversions: EU, US, UK, JP, CN

Once you have your length in cm, here is the universal conversion. All ONLY REPS sneakers follow the official EU sizes of the original brand, but we also indicate the corresponding US and UK sizes on each product page.

5.1 — Full men's chart (38 to 48 EU)

5.2 — Full women's chart (35 to 42 EU)

5.3 — Margin to apply

Here's the golden rule that changes everything: always add 0.5 to 1 cm to your raw measurement for comfort margin. A sneaker that's exactly the length of your foot will hurt after 30 minutes because:

• Your foot slides forward with each step (going down stairs, running).
• Your foot swells throughout the day.
• Your toes need space to curl naturally.

Reference: if you measure 26.5 cm, your size is 27.0 to 27.5 cm in shoe interior, which is 42-42.5 EU.

Why your sneakers are 1 size different from one brand to another

Recurring question: "I'm a 42 in Nike, but a 41.5 in Adidas, and 43 in New Balance — why?". Because each brand uses a different last (wooden form), and these lasts each have their own cutting philosophy.

6.1 — The concept of the last

The last (in French: "forme") is a wooden or hard plastic mold around which the entire shoe is constructed. Imagine a foot mannequin: that's exactly what it is. Each brand has developed its own lasts over decades, and these lasts are jealously guarded — they represent the brand's technical DNA.

A Nike Air Force 1 and an Adidas Stan Smith are built on radically different lasts: not the same arch, not the same width, not the same forefoot angle. Result: your internal feeling will be totally different, even with an identical size tag.

6.2 — Design schools

Brands can be classified into major families according to their sizing approach:

6.3 — Why 1:1 reps reproduce these differences

Premium 1:1 rep factories use the same types of lasts as official factories. To produce a Nike rep, the partner factory uses a last copied from the official Nike last. Result: size differences between brands are faithfully preserved in the rep world.

Specifically: if you know you're a 42 in Nike retail, you're a 42 in Nike rep. If you're a 41.5 in Adidas retail, you're a 41.5 in Adidas rep. No "general rep rule," each brand keeps its sizing.

Nike sizing: model by model guide

Nike is the most produced brand in reps, and fortunately their sizing is generally consistent and predictable. But between models, there are nuances you need to know.

7.1 — Air Force 1 (Low / Mid / High)

Sizing: true to size. The Air Force 1 is one of the widest sneakers on the market. If you have normal to narrow feet, you can even go down 0.5 size. If you have wide feet, your usual size is perfect.

7.2 — Air Max 90 / 95 / 97

Sizing: true to size, sometimes +0.5 recommended. Air Max has a more fitted cut than Air Force, especially in the forefoot. If you have a high instep or wide feet, go +0.5.

7.3 — Dunk Low / High

Sizing: true to size, some batches run small. Dunks produced in 2023-2024 tended to run -0.5. 2025-2026 productions have returned to standard sizing. On ONLY REPS, we indicate "runs small" for affected batches.

7.4 — Vapormax / Air Max Plus / Air Max Scorpion

Sizing: runs large, take -0.5. The soft mesh construction stretches with wear, so a size too large will quickly look washed out.

7.5 — Cortez / Killshot / Daybreak

Sizing: true to size. Flat and retro models, last faithful to the 70s-80s. Compatible with most foot types.

7.6 — Running models (Pegasus, Vomero, Alphafly)

Sizing: take +0.5 to +1. Specific to running: you need space for the foot's back-and-forth movement during strides.

Adidas sizing: Yeezy, Samba, Gazelle, Stan Smith

Adidas is the other major historical brand. Its sizing is more complex than Nike's because the German brand uses narrower lasts, and some iconic models have specific characteristics to know.

8.1 — Yeezy (350, 380, 700, 500, Foam Runner)

Subject to controversy, but here's the truth by model:

• Yeezy 350 V2: runs small, take +0.5 minimum, +1 if wide foot.
• Yeezy 380: runs small, take +0.5.
• Yeezy 700 (V1, V2, V3): true to size, or +0.5 if you're unsure.
• Yeezy 500: true to size.
• Yeezy Foam Runner: runs very small, take +1 mandatory (sometimes +1.5 if wide foot).
• Yeezy Slide: runs small, take +1.

8.2 — Samba (OG, Vegan, Wales Bonner collab)

Sizing: runs large, take -0.5. The Samba last is very thin and long. If you take your usual size, you'll have heel slippage. Half-size down almost systematically.

8.3 — Gazelle (OG, Bold, Indoor)

Sizing: true to size, sometimes -0.5. Like the Samba but slightly more rounded at the front. Most people take their usual size.

8.4 — Stan Smith / Superstar

Sizing: true to size. Classic models with a fairly generic last. No surprises.

8.5 — Campus / Handball Spezial

Sizing: -0.5. Thin models, run very slightly large.

Jordan sizing: detailed guide by generation

Jordan is technically a sub-brand of Nike, so it uses the same lasts. But the length of its history (the 1st Air Jordan dates back to 1985!) means each generation has its specificities.

9.1 — Air Jordan 1 (Low / Mid / High / Retro High OG)

Sizing: true to size, take +0.5 if you have a high instep. The Jordan 1 has an iconic high cut that can be tight on the instep. If you have a "thin" foot on top, your usual size. Otherwise, +0.5.

9.2 — Air Jordan 3 / 4 / 5

Sizing: true to size. Jordan 3, 4, and 5 are among the most consistent. Your usual size works in 95% of cases.

9.3 — Air Jordan 6 / 11

Sizing: true to size, +0.5 if wide foot. The Jordan 11 has a patent leather overlay that doesn't stretch, so if in doubt, take +0.5.

9.4 — Air Jordan 12 / 13

Sizing: true to size. Fairly wide, comfortable cut.

9.5 — Air Jordan 14 / 17 / 19

Sizing: runs large, -0.5. Rarer models in reps, but when you find them, expect -0.5.

9.6 — Collaborative Jordans (Travis Scott, Off-White, Dior, Union, etc.)

Sizing: follows the sizing of the base model. A Travis Scott Jordan 4 = standard Jordan 4 sizing. An Off-White Jordan 1 = standard Jordan 1 sizing. Collaborations do not affect the last.

Amiri sizing: Skel-Top, Court-Hi, MA-1

Amiri is one of the most popular brands on ONLY REPS. Its sneakers (Skel-Top in particular) have become a symbol of Californian streetwear luxury. Here are the sizing rules:

10.1 — Amiri Skel-Top (Low / Mid / High)

Sizing: true to size. The Skel-Top uses a classic American last, similar to American basketball sneakers from the 80s. Your usual size is perfect.

Specificity: the forefoot of the Skel-Top is slightly more pointed than average. If you have square feet or wide toes, feel if the toe box is tight — then take +0.5.

10.2 — Amiri Court-Hi / MA-1

Sizing: true to size. More modern models, standard lasts. No surprises.

10.3 — Amiri Stadium Low

Sizing: -0.5 recommended. Model inspired by vintage stadium sneakers, runs slightly large.

10.4 — Amiri in general (apparel)

For Amiri t-shirts, hoodies, jeans, shorts, and tracksuits, Amiri apparel sizing is consistent with standard European sizes. If you usually wear M, take M in Amiri.

For the cut: Amiri goes for a "controlled oversized", neither too fitted nor too relaxed. Very flattering on most body types.

Trapstar sizing: sneakers and collaborations

Trapstar is primarily an apparel brand (hoodies, tracksuits, vests), but their expansion into sneakers is growing.

11.1 — Trapstar Football Sneakers

Sizing: true to size. Inspired by football boots, standard EU sizing.

11.2 — Trapstar Apparel (hoodies, tracksuits, vests)

Sizing: true to size with intentional oversized cut. If you wear M, you take M, and you get a stylish oversized cut. If you want a fitted cut, take -1 (S instead of M).

11.3 — Specificity of chenille embroidery

Chenille hoodies (Trapstar Chenille) have dense 3D embroidery that adds rigidity. If you hesitate between 2 sizes, take the larger one for comfort.

Corteiz sizing: the UK cut

Corteiz (CRTZ) is the brand that has redefined UK streetwear since 2017. Their sizing is specific:

12.1 — General Corteiz Apparel

Sizing: intentional oversized, your usual size. Corteiz intentionally produces loose cuts. If you wear M, take M, accept that it will be loose. If you want fitted, take S.

12.2 — Specific models

• Alcatraz Tracksuit: controlled oversized cut, your usual size.
• Cargo Pants: loose fit, your usual size (the loose fit is intentional).
• Vault Hoodie: boxy cut, take your size for a correct look, -1 for fitted.
• Long Sleeve T-shirts: slightly elongated cut, true to size.

See our complete Corteiz collection for available models.

Chrome Hearts sizing: Californian luxury

Chrome Hearts has a very particular approach: US sizing (not EU). Important to understand.

13.1 — Chrome Hearts Apparel

Chrome Hearts t-shirts and hoodies are labeled in US sizes:

Specifics: Chrome Hearts t-shirts fit +1 vs US standard. If you usually wear M (US), take S in Chrome Hearts for a fitted look, M for a correct look.

13.2 — Iconic cut

Chrome Hearts t-shirts are recognizable by their cropped boxy fit. If you wear your t-shirt over your pants, take your usual size. If you tuck it into your pants (rare), take +1.

Sp5der and Korean brands: the +1 rule

Korean brands (Sp5der leading the way, followed by some Stussy KR collabs, Verdy, Wasted Paris) follow Asian sizing standards, which are on average 1 size smaller than US/EU standards.

14.1 — The universal rule

+1 systematically on all Sp5der pieces. If you usually wear M, take L in Sp5der. If you wear L, take XL.

14.2 — Exceptions

Some recent Sp5der models (SS25, SS26 seasons) are produced with more generic sizing. On ONLY REPS, we indicate "international size" on the relevant product pages.

Mind 001 and slides: the specificity to know

Our flagship product, Mind 001 Slides, is inspired by a viral TikTok design. Crucial specificity:

If you wear 42 EU, take 43 for Mind 001. If you wear 44, take 45. And so on.

Retail vs 1:1 reps sneakers: size difference?

Recurring question. Clear answer: no difference in 95% of cases. Premium 1:1 reps produced by ONLY REPS' partner factories use lasts copied from official lasts — so internal dimensions are identical to the millimeter.

16.1 — The remaining 5%

Cases where you might observe a 1/2 size difference:

• Very recent models: the first batches produced by the factory may have a calibration difference of 2-3 mm.
• Asian Chinese versions: some factories label in CN sizes by default. ONLY REPS always converts to EU on the product pages.
• Tier 2 or Tier 3 models: low-cost factories take liberties with dimensions. This is one of the reasons why we only sell Tier 1.

To understand quality levels (Tier 1, 2, 3, 4), read our expert guide on how to recognize a true 1:1 rep.

The half-size rule (.5)

Half sizes (39.5, 40.5, 41.5, etc.) are available on most main models but not on all obscure models. Here's what to do:

17.1 — If the half-size exists

Take it. The comfort margin will be optimal. Example: your foot measures 26.7 cm = needs 42 or 42.5. 42.5 gives you more margin without being loose.

17.2 — If the half-size doesn't exist

Take the size above, never below. A slightly loose sneaker can be fixed with:

• An insole (1 to 3 mm thick).
• Thicker socks.
• A tighter shoelace knot.

A too-small sneaker cannot be saved. Your toes will hurt, and you'll abandon it.

Choosing between 2 sizes: the decision algorithm

Hesitating between 2 sizes? Here is the official ONLY REPS decision tree:

Universal rule: when in complete doubt, take the size above. It's easier to correct than a size below.

Socks: their real impact on your size

Often overlooked subject. The thickness of your socks can account for up to 1/2 size difference in some fitted sneakers.

19.1 — Thin socks (sport, summer)

Thickness 1-2 mm. No impact on size. Measure your foot with these socks, choose your standard size.

19.2 — Mid-thick socks (daily)

Thickness 3-4 mm. Minimal impact, +0 to +0.5 depending on the sneaker. Measure with these socks to get your daily reference.

19.3 — Thick socks (winter, hiking)

Thickness 5-7 mm. Significant impact, +0.5 to +1 on fitted sneakers. If you primarily wear thick socks, take +0.5 on your orders.

19.4 — High / technical socks

For streetwear brands (Trapstar, Sp5der), high socks are often integrated into the look. No impact on sneaker size, but beware if you wear thick technical socks.

Foot width: E, EE, normal — what changes everything

Length is only part of the equation. 20% of people have a foot considered "wide" or "extra-wide", and for them, choosing solely based on length systematically leads to discomfort.

20.1 — How to know if you have wide feet

Simple test: place your foot on a sheet of paper, trace its outline. Measure the width at the widest point (just behind the toes).

Reference for men's 42 EU: 10.0 cm = standard, 10.5 cm = wide, 11.0 cm = extra-wide.

20.2 — Strategies for wide feet

• Favor wide brands: Nike Air Force 1, New Balance, Vans Old Skool.
• Avoid narrow brands: Adidas Samba, Converse Chuck Taylor 70s.
• For fitted sneakers, take +0.5 to +1.
• Favor low or mid-top models which are more forgiving than high-tops.

20.3 — Strategies for narrow feet

• You can allow for the most fitted cuts (Adidas Samba, Stan Smith).
• For wide Nikes, you can take -0.5.
• Favor mid-thick socks to fill the space.
• Invest in branded insoles like Sof Sole to stabilize.

Asymmetrical feet: managing a left/right difference

More than 60% of people have a length difference between their left and right foot. Average difference: 2 to 5 mm. Extreme cases: up to 1 cm. Here's how to manage:

21.1 — If the difference is less than 5 mm

Take your size based on the longer foot. The shorter foot will have a little room, but this is not a problem — you can put a mini insole on that side to secure it.

21.2 — If the difference is greater than 5 mm

More complex decision:

• You can take 2 different sizes (rare, requires direct contact).
• More practical: size of the longer foot + thick insole on the shorter foot side.
• For very fitted models, take 0.5 down (between your 2 measurements), with an insole.

21.3 — Extreme case (>1 cm)

Podiatrist consultation recommended. You can benefit from custom orthopedic insoles that balance the difference. No shame in talking about it — it's more common than you think.

Sneakers and orthotics: compatibility, size choice

If you wear orthopedic insoles (recommended by a podiatrist), allow for +0.5 to +1 depending on the thickness of the orthosis.

22.1 — Thin orthosis (3-5 mm)

Impact: +0.5. Choose models with removable insoles (most Nikes, Adidas, Asics).

22.2 — Thick orthosis (>5 mm)

Impact: +1. Avoid slim and fitted models (Adidas Samba, Vans Old Skool). Favor Air Force 1, Air Max, New Balance, Asics — which have more internal volume.

22.3 — Models to avoid with orthosis

• Yeezy Foam Runner and Slides (non-removable insole).
• Vans Authentic and some low-top models with a low cut.
• Very fitted Italian luxury sneakers.

The 10 most common mistakes (and how to avoid them)

How to try on correctly at home

You received your sneaker. Here is the 7-step try-on protocol to validate the size before wearing it outside (otherwise return impossible):

1. Take the sneaker out of the box in a clean environment (on carpet or parquet, never on outdoor ground).
2. Check the packaging first: intact box, spare laces, anti-humidity sachet, sticker. If everything is present, you have a true Tier 1.
3. Put on your usual socks.
4. Put on the sneaker while standing, without forcing it, using a shoehorn or the back pull tab.
5. Thumb test: you should have about a thumb's width of space between the end of your longest toe and the front of the sneaker. No more, no less.
6. Walk 5 minutes in the house. Stair test (especially going down: if your toes touch the front when going down, size too small). Feet together test. Pivot test.
7. If comfortable: keep it. If uncomfortable: put it back in the box without any traces, contact us for a return within 14 days.

If the size is wrong: ONLY REPS return process

Did you choose the wrong size? Don't panic, here's the simple process:

25.1 — Start the return

1. Go to our Returns page.
2. Enter your order number and the reason (size).
3. You will receive a pre-paid return label within 24 hours (free in France).
4. Put the sneaker back in its original box + all accessories.
5. Drop it off at the indicated relay point or post office.

25.2 — Exchange or refund?

You choose:

• Exchange (different size, same product): we will send you the new size upon receipt of the return. Free re-shipment costs.
• Full refund: within 5 to 10 working days after receipt and quality control at our facility.

25.3 — Return Conditions

• Within 14 days of receipt.
• Item never worn outdoors.
• Original box and accessories.
• Intact tags.

More details on our complete delivery-return-payment guide.

Glossary of technical sneaker terms

FAQ: 20 expert questions we get every day

Extreme special cases: atypical feet

If you have atypical feet, here's how to guide yourself.

Very wide feet (EE / EEE)

Systematically prioritize Nike Air Force 1, Air Max 90, New Balance 990 series, Vans Old Skool. Avoid all narrow Adidas, Converse 70s, luxury Italian sneakers. If you order an unusual model for wide feet (e.g., Skel-Top), take at least +0.5.

Very narrow feet

You're lucky: you can wear almost anything without issue. Even prefer fitted models (Adidas Samba, Stan Smith, Italian sneakers) for a premium look. Invest in branded insoles to fill space if needed.

Very high arch

Flat sneakers (Vans, Stan Smith, Converse) will be uncomfortable for long periods. Prioritize models with arch support: Asics Gel-Lyte, Nike Air Max, Skechers Arch Fit. If necessary, add custom orthotics.

Diabetic / sensitive feet

Prioritize sneakers without aggressive internal seams. Asics is known for its seamless finishes. Avoid Sp5der and some high-fashion models that may have uncomfortable internal embroidery.

Bunions (hallux valgus)

Choose models with a rounded and wide toe box (Air Force 1, Skel-Top, Asics Nimbus). Avoid pointed toes: Converse 70s, pointed Italian sneakers, some luxury collaborations.

External tools and resources

To go beyond this guide:

Online tools

• Online Brannock device: Print a paper Brannock from the official brannock.com website ("Resources" page).
• Size converters: SizeCharter, Asos, Zappos. Useful for double-checking, but our table (section 5) remains the reference.
• 3D scan apps: Nike Fit (free), Adidas AR (free). 80-90% accuracy.

Expert resources

• Sneaker News: sneakernews.com for releases and reviews.
• Hypebeast: hypebeast.com for sneaker culture.
• r/Sneakers and r/Repsneakers: Reddit communities with real experience feedback (in English).
• RepArchive: quality database by batch and factory (English).

Professional podiatry

If you have recurring problems, consult a podiatrist. A 50-80€ consultation can save you years of discomfort. They will analyze your gait, pronation, and recommend the types of sneakers suitable for your morphology.

The personalized ONLY REPS service

For complex orders, we offer a free sizing advice service. Email support@onlyreps.fr with:

• Your foot length in cm (left and right).
• Your specificities (wide, narrow, high arch, etc.).
• The model you are looking for.
• 3 pairs you already wear in your usual size.

Response within 2 hours on weekdays, with precise recommendations to the half-size.

History of sneaker sizing: 100 years of evolution

To truly understand why sizing is so complex today, we need to go back in time. The sizing system we use is the result of 100 years of industrial tinkering, without any global authority ever bringing order to it.

28.1 — Before 1925: total anarchy

At the beginning of the 20th century, every shoemaker and every brand used its own scale. "Small/medium/large" sizes coexisted with specific numbering systems for each country, sometimes even each region. Buying shoes outside one's hometown was a ordeal.

In 1864, Edwin Simpson published the first "Universal Foot Size Standard" in the USA, based on inches and divided into half-sizes. It was a start, but adoption was limited.

28.2 — 1925: the Brannock revolution

Charles F. Brannock, an American passionate about mechanics, invented in 1925 the device that bears his name: the first tool capable of simultaneously measuring foot length, width, and arch position. It was a revolution for shoe stores.

The Brannock device was quickly adopted by all American stores and remains to this day the gold standard for foot measurement. The Brannock company still exists and still manufactures the same tools in Liverpool, NY.

28.3 — Post-war: birth of regional standards

Between 1945 and 1970, several regional systems crystallized:

• American standard (US): based on the Brannock, in inches. Differentiates men and women with a 1.5 offset (a women's US 8 = men's US 6.5).
• European standard (Paris Point / EU): based on the "Paris point," i.e., 6.66 mm per size. French origin, adopted by all of continental Europe.
• British standard (UK): similar to US but with a 0.5 offset. Inherited from the British Empire.
• Japanese standard (JP): based on the exact centimeter of foot length. The most precise and logical.

28.4 — 1970-1990: the sneaker explosion

The advent of the modern sneaker (Nike founded in 1964, Adidas reorganized in the 70s) created a new problem: sports brands developed their own lasts, optimized for performance, which sometimes deviated from dress shoe standards.

The Air Force 1 (1982) introduced a wide and comfortable last. The Stan Smith (1971) offered a slender, European last. The Converse Chuck Taylor (already around since 1917) used a very specific "vulcanized" last. Result: 3 iconic sneakers, 3 different sizings for the same label.

28.5 — 2000s: globalization and confusion

The arrival of Asian brands in the Western market (Asics, Onitsuka, Mizuno, later Sp5der) introduced the JP/CN standard. Global e-commerce (Amazon, Zappos) attempted to standardize via "converters," but with frequent errors.

Adidas attempted internal harmonization in 2010 with its "global sizing" system, but the idea was quickly abandoned because it disadvantaged certain markets.

28.6 — 2020-2026: the era of reps and assumed complexity

With the explosion of the reps market and the emergence of new streetwear brands (Sp5der, Corteiz, Trapstar), complexity has reached its peak. Today, an informed buyer must know 4-5 different sizing systems and the specificities of each brand — which is exactly why we wrote this guide.

The future: perhaps a revolution via 3D foot scanning with smartphones (Nike Fit, Adidas AR) that will eventually allow ordering the perfect size without human intervention. But we're not there yet.

5 Case Studies: Real Personas and Their Sizing

Rather than abstract rules, here are 5 real (anonymized) cases from our customer service. Each illustrates a common problem and its solution.

29.1 — Case n°1: Marc, 33, wide foot, Skel-Top sneakers

Profile: Marc wears a 43 EU in dress shoes, but his forefoot is 9 cm wide (wide). He ordered an Amiri Skel-Top in 43.

Initial problem: Upon receipt, the sneaker fit in length but was very tight on the sides. Marc considered returning it.

Diagnosis: Our support recommended +0.5 (43.5) to gain width without being too loose in length. Free exchange was performed.

Result: Marc has been wearing his Skel-Top every day for 8 months, perfect comfort.

Lesson: For wide feet, the right adjustment = +0.5 on fitted models like the Skel-Top. Width takes precedence over length.

29.2 — Case n°2: Sophie, 27, foot asymmetry, Air Force 1

Profile: Sophie has a 6 mm difference between her left foot (24.8 cm) and right foot (25.4 cm). She ordered an Air Force 1 Low.

Initial problem: Sophie hesitated between 39 and 40 EU. She ordered 39.5.

Diagnosis: Our support recommended taking the size of the longer foot (40 EU) with a mini 1mm insole for the left foot. More comfortable in the long term.

Result: Sophie followed the advice, took 40, added a thin insole. No problems after 1 year.

Lesson: In case of marked asymmetry, always start with the longer foot. Compensation is made on the other side.

29.3 — Case n°3: Karim, 19, first reps purchase, Sp5der hoodie

Profile: Karim is 1m78 tall, usually wears M in t-shirts. First reps purchase: an Sp5der OG Web hoodie.

Initial problem: Karim ordered M thinking it would work, without checking the Sp5der specific sizing. Upon receipt, the hoodie was too short and tight.

Diagnosis: Karim didn't see the "mandatory +1" note on the product page. Our support performed a free exchange for an L.

Result: The L fit perfectly, with a controlled oversized cut. Karim has since taken XL in Sp5der to maintain this logic.

Lesson: Always read the sizing note on the product page. Sp5der = mandatory +1, it's the universal rule.

29.4 — Case n°4: Lucas, 41, orthopedic insoles, Yeezy 350

Profile: Lucas has been wearing orthopedic insoles for 5 years (4mm thick). He wears 44 EU in normal sneakers.

Initial problem: He ordered a Yeezy 350 V2 in 44 (believing that for the brand, he should take +0.5 due to Yeezy sizing). The insole didn't fit.

Diagnosis: Our support explained: Yeezy 350 = +0.5 minimum. With 4mm orthopedic insole = +1 total. So recommended size = 45 EU.

Result: Exchanged for 45, perfect with insole. Lucas has since applied this rule to all his orders.

Lesson: Combine adjustments: if the model already requires +0.5, add another +0.5 for the orthopedic insole. Think about the combination.

29.5 — Case n°5: Emma, 24, very narrow foot, Trapstar Football Sneaker

Profile: Emma wears 38 EU with a very narrow foot (B in US). She ordered a Trapstar Football Sneaker.

Initial problem: The 38 fit in length, but Emma's heel slipped. She considered returning for a 37.5.

Diagnosis: Our support recommended keeping the 38 and adding medium-thick socks + tight laces. A 37.5 risked pinching her toes.

Result: Emma kept the 38 with adapted socks. No slipping, optimal comfort.

Lesson: For narrow feet, do not sacrifice length for width. Use textile solutions (socks, insoles) before taking a size down.

The Science Behind Sizing: Podiatry and Biomechanics

For enthusiasts (and the curious), here are the scientific fundamentals that explain why sizing matters so much.

30.1 — The biomechanics of walking

When you walk, your foot goes through 3 phases in less than 1 second: heel strike, foot roll, toe-off. During these phases, your foot moves within the shoe by several millimeters:

• Heel strike: your foot slides slightly backward (3-5 mm).
• Foot roll: the foot lengthens slightly and widens (up to 4 mm in length).
• Toe-off: the toes push forward and down.

Conclusion: your sneaker must have at least 8-10 mm of space at the front to absorb all these movements. This is why we systematically recommend +0.5 to +1 cm over your raw measurement.

30.2 — Pronation and supination

When your foot rolls inward during walking, it's called pronation. When it rolls outward, it's supination. The majority of people (60%) have neutral pronation, 25% have marked pronation (overpronation), and 15% have supination.

These patterns influence sneaker choice:

• Overpronator: favor "stability" models (Asics Gel-Kayano, Brooks Adrenaline). Avoid overly flexible soles.
• Supinator: look for "neutral cushioning" (Asics Nimbus, Nike Pegasus). Avoid very firm models.
• Neutral: you can wear almost anything without problems.

30.3 — Daily physiological variations

Your foot is not static:

• In the morning: smallest foot (nocturnal vasoconstriction).
• In the afternoon: foot at its average size.
• In the evening: foot swollen by 4-8% (depending on activity and heat).
• After intense exercise: temporary swelling up to 10%.

That's why it's recommended to measure in the evening: you get the "max" size of your foot, which corresponds to what you'll have in your sneaker at the end of the day. Podiatrists even recommend trying on sneakers after a 30-minute walk to assess comfort in "established" conditions.

Vintage / Deadstock Sneakers: Different Sizing?

If you're ordering vintage sneakers (deadstock from the 80s, 90s, or 2000s) or re-releases of old models, be aware that sizing can differ significantly from modern production.

31.1 — Why Vintage Sneakers Size Differently

• Lasts have been refined over the decades. An original 1985 Air Jordan 1 is narrower than a 2026 retro.
• Materials have changed. Real leather from the 80s stretched more than modern synthetic leathers.
• Sizing conventions have evolved. US sizes in the 90s were sometimes slightly larger than current US sizes.

31.2 — Re-releases vs OG

A 2026 re-release of a 1985 model generally uses the original lasts but with modern materials. The result: sizing true to the OG, modern comfort.

On reps, these specificities are reproduced: a Jordan 1 OG re-release sizes like the 1985 OG, not like a modern Jordan 1.

31.3 — Collector's Sneakers / Limited Collabs

For collabs (Travis Scott, Off-White, Dior, Union, etc.), the sizing remains that of the base model. A Travis Scott Air Jordan 1 = Jordan 1 OG sizing. No surprises there.

Sneakers and Athletic Performance: How Size Changes Things

If you use your sneakers for sports (running, basketball, gym, dancing), sizing becomes even more critical.

32.1 — Running

+0.5 to +1 mandatory. While running, your foot moves 5-10 mm forward with each stride. Without this margin, you'll have black, or even lost, toenails in less than 10 km.

32.2 — Basketball

+0 to +0.5. You need lateral stability, so not too much margin. But quick pivots and stops require a few mm of play.

32.3 — Gym / Cross-training

True to size. You need a precise fit for stability exercises (squats, deadlifts, lunges). A low-cut sneaker with a flat sole is ideal.

32.4 — Dance / Hip-hop

+0.5. Multi-directional movements require a bit of margin but not too much to avoid twisting.

32.5 — Daily Urban Walking

+0.5 to +1. More comfort = more wear = better return on investment. The urban trap: buying too fitted "for the look" and ending up not wearing the sneaker.

Sizing by Category: Low-tops, High-tops, Runners, Basketball

Beyond brands, the sneaker category influences your size choice. Here are the rules by silhouette.

33.1 — Low-tops (Air Force 1, Stan Smith, Dunk Low)

The most forgiving category. True to size in 90% of cases. You can go +0.5 if you're hesitant. The exposed ankle allows for more tolerance in the overall fit.

33.2 — Mid-tops (Skel-Top Mid, Jordan 1 Mid)

True to size. The mid-top provides ankle support without constricting it. If you take your usual size, you'll be comfortable.

33.3 — High-tops (Jordan 1 High, Air Force 1 High, Skel-Top High)

True to size, +0.5 if you have a high instep. High-tops come up the ankle and can feel tight if you have a pronounced instep. Check the flexibility of the upper before choosing: if it's rigid (thick leather), go +0.5.

33.4 — Technical Runners (Vapormax, Pegasus, Yeezy 700)

+0.5 to +1 mandatory. Runners need room for the dynamics of running. A too-fitted runner = black toenails guaranteed.

33.5 — Pro Basketball (LeBron, Kobe, KD)

True to size, but fitted. Basketball shoes require a precise fit for pivots and quick stops. No extra margin.

33.6 — Skate (Vans, Janoski, Adidas Campus)

-0.5 often. Skate sneakers should be a bit snug for board sensitivity. If in doubt, size down.

33.7 — Slip-on / Mules / Slides

Varies by model. Luxury mules (Birkenstock-style): true to size. Mind 001 slides: +1 mandatory. Vans slip-ons: -0.5 (they stretch quickly).

33.8 — Boots (Timberland, Yeezy 1050, Nike SFB)

+0.5 to +1. Boots are often worn with thick socks. And the rigid leather/Gore-Tex requires some room.

Women: Specifics of Sneaker Sizing

While most models are unisex, there are specific considerations for women's sizing.

34.1 — Men's to Women's Conversion

American brands (Nike, Jordan, Converse) often use a 1.5 difference between men's US and women's US sizes:

This means a woman can easily wear a sneaker labeled "men's" by converting the size. And vice versa.

34.2 — Specifically Women's Silhouettes

Some models exist in feminine silhouettes (reduced size, lower heel, narrower last):

• Nike Cortez women's (narrow, low)
• Adidas Gazelle Bold (feminine raised sole)
• Air Jordan 1 Mid SE women's (specific last)

For these models, follow the women's chart. For all others, the universal chart (section 5) works.

34.3 — Women's Feet: Supposedly Narrower?

Partially true myth. Statistically, women have slightly narrower feet than men for the same length. But individual variations are huge: 30% of women have feet considered "wide" by American standards.

Tip: don't rely on statistics, measure the width of YOUR foot (section 20).

Maintenance: Preserving Your Sneakers' Size Over Time

A well-maintained sneaker retains its original size for 3-5 years. A mistreated sneaker stretches, deforms, and becomes uncomfortable. Here are the golden rules.

35.1 — Shoe Trees

The #1 investment if you want to preserve your sneakers. After each wear, slide a shoe tree into the sneaker. It maintains the shape, absorbs moisture, and prevents creases.

Recommended models: cedar shoe trees (absorb and scent), €15-25 per pair.

35.2 — Storage

Store your sneakers in their original box, with tissue paper inside, in a dry and temperate place. Avoid:

• Damp floors (cellars).
• Direct sun exposure (discoloration).
• Stacking without protection (deformation).

35.3 — Washing

Never machine wash leather sneakers. For textiles, use a delicate 30° max program, in a pillowcase. For leather, gentle dry brushing then a damp cloth.

35.4 — Rotation

Ideal: have at least 2 pairs in rotation. A sneaker worn daily wears out twice as fast as one worn every other day. Rotation allows leather/textile to "breathe" and regain its shape.

The Future of Sizing: 3D Scan and AI

The industry is evolving rapidly. Here are the 2026-2030 trends.

36.1 — 3D Foot Scanning Apps

Nike Fit (launched in 2019), Adidas AR (2021), True Fit. These apps use your smartphone to 3D scan your foot and recommend the perfect size for each model.

Current limitation: 80-90% accuracy depending on the brand, still insufficient to eliminate 100% of sizing errors.

36.2 — Predictive AI Based on History

Platforms like Zappos and ASOS are starting to use AI to analyze your previous orders and recommend the correct size for a new model. ONLY REPS is working on this technology for 2027.

36.3 — Custom Sneakers (3D Printing)

Adidas launched Futurecraft 4D in 2018: sneakers with a 3D-printed sole adapted to your foot. Still experimental and expensive (€350-500), but the future is probably here.

36.4 — Implications for Reps

The reps market always follows the official market with a 1-2 year delay. When 3D scanning becomes mainstream, we will integrate it. For now, the paper method (section 4) remains the most reliable and accessible.

Scientific Sizing: The Podiatric Approach

37.1 — The 5 Foot Morphotypes

Podiatrists classify feet into 5 main morphotypes:

1. Greek foot: 2nd toe longer than the big toe (30% of the population). Requires a rounded toe box.
2. Egyptian foot: big toe is the longest, progressive decrease (50% of the population). Adapts to everything.
3. Square foot: toes of similar length (15% of the population). Requires a wide toe box.
4. Germanic foot: second and third toes extend beyond (3% of the population). Special case.
5. Celtic foot: very long big toe (2% of the population). Very few suitable models.

37.2 — Morphotype and Brand Correspondence

37.3 — Pronation and Supination: Impact on Choice

Pronation (foot rolling inward while walking) and supination (outward) influence sneaker choice.

Over-pronator (25% population): look for "stability" models like Asics Gel-Kayano, Brooks Adrenaline. Avoid very flexible soles.

Supinator (15% population): look for "neutral cushioning" (Asics Nimbus, Nike Pegasus). Avoid very firm models.

Neutral pronation (60% population): you can wear almost anything without issues.

37.4 — 3D Scan: Emerging Technologies

Several apps allow you to 3D scan your foot via smartphone:

• Nike Fit: since 2019. 80-85% accuracy. Free.
• Adidas AR Size Finder: since 2021. 75-85% accuracy.
• True Fit: third-party service integrated by several retailers.
• Bootfit: running specialist.

These technologies are improving rapidly but do not yet replace the traditional paper method (section 4) for complex cases.

37.5 — Biomechanical Analysis

For athletes or people with chronic problems, a biomechanical analysis at a podiatrist's office is recommended. It costs €60-120 and analyzes:

• Gait pattern analysis.
• Plantar pressure distribution.
• Ankle/knee/hip joint angles.
• Diagnosis of problems.
• Recommendations for sneakers and/or orthotic insoles.

Conclusion: The Final 7-Point Checklist

You now have everything you need to never make a mistake again. Recap:

1. Measure your foot in cm, in the evening, with socks on, standing.
2. Add 0.5 to 1 cm for comfort margin.
3. Convert to EU with our table (section 5).
4. Check brand specifics (Sp5der +1, Mind 001 +1, Yeezy Foam +1, Samba -0.5, rest true to size).
5. If in doubt between 2 sizes, take the larger one.
6. Upon receipt, try them on indoors before wearing them outdoors.
7. If they don't fit, free returns within 14 days in France.

At ONLY REPS, our mission is for every order to be the right size on the first try. With this guide, you have a 95% chance of achieving this. For the remaining 5%, we are here to support you—that's why we perform manual quality checks and have customer service that responds within 2 hours.

Article written by the ONLY REPS expert team, updated April 2026. This guide is the official sizing reference for our store. Do you have a case not covered? Write to us: we'll add it to the next version.

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• How to dress well in streetwear: the beginner's guide
• Delivery, returns, payment: the complete guide
• 1:1 reps vs. original: the complete guide
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