Common Projects Size Guide: How They Fit

The most repeated Common Projects sizing advice is also the least complete: “size down.” It can be a useful starting point for some feet and some models, but it is not a dependable rule by itself. The Achilles Low has a refined profile, while foot width, instep height, sock choice, and personal space preference can change the correct answer.

The better method is to compare measurements and fit characteristics in a consistent order.

Step 1: Start with a shoe that already fits

Choose a low-top sneaker you can wear for several hours without heel slip, pressure at the widest part of the foot, or toes touching the front. Remove its insole if possible and measure the full length from heel to toe in centimeters. Record the width at the broadest point as well.

Foot length alone is less reliable because people leave different amounts of toe room. A well-fitting insole captures both your foot and your preferred allowance.

Step 2: Identify the exact size labels in the listing

Our current men's Common Projects listings use EU 39–47 with a US reference, while current women's listings use EU 34–42 with a US reference. Those paired labels are catalog information for these products; they should not be treated as a universal conversion across every brand.

Read the complete option label before selecting. A US number on a retailer page can be a conversion reference rather than the number printed inside the shoe.

Step 3: Account for width and instep

Two people with the same foot length can need different sizes. If the forefoot is wide, sizing down may create pressure even when the toe length looks acceptable. A high instep can make the laces spread or create pressure across the top of the foot. A narrow, low-volume foot may tolerate less length without heel movement.

When in doubt, ask for three pieces of information for the exact pair:

• Insole length
• Insole width at the forefoot
• Whether the insole is removable for measurement

These do not guarantee fit, but they turn a vague recommendation into a useful comparison.

Step 4: Decide how you will wear the shoe

Thin dress socks and substantial athletic socks can change the feel noticeably. So can a full day of walking compared with short indoor wear. Feet often swell over the course of the day, so test a new pair later in the day on a clean indoor surface while preserving the return condition.

Do not try to solve a clearly tight shoe by assuming leather will stretch dramatically. Leather can soften and conform, but the sole length and basic structure do not change.

A practical decision rule

If your measured reference insole closely matches one offered size and you have average-width feet, start there. If your foot is wide or high-volume, favor adequate width and instep room. If your foot is narrow and you are genuinely between sizes, the smaller option may be worth considering—but only after comparing measurements.

For pairs bought as a gift, avoid guessing from a dress-shoe size. Ask for the EU size from a current sneaker and a photo of its size label if possible.

Before removing tags or wearing outdoors

Try both shoes indoors with the socks you intend to use. Walk on carpet or another clean surface. Check for heel movement, forefoot pressure, toe contact on a downward step, and lace pressure across the instep. Review the store's return conditions before creasing the shoe or marking the outsole.

Fit guidance is advice, not a guarantee. The exact product listing and current return policy control. Start with the Achilles Low White or compare our men's and women's sizing guide.