When investing in a pair of Common Projects sneakers, sizing is one of the most important decisions you’ll make. With prices often in the luxury range, getting the fit right the first time matters. The brand is known for its sleek Italian construction and minimalist silhouette — but how do Common Projects actually fit? Do they run big or small? Should you size down? How do they compare to Nike, Adidas, or other luxury sneaker brands?

This complete 2026 guide breaks down sizing, fit characteristics, international size conversion, and comparisons with popular sneaker brands.

Understanding Common Projects Sizing

Common Projects uses European (EU) sizing, not US or UK sizing. This is important because:

• The shoes are made in Italy.

• EU sizing tends to be more precise in length.

• Many buyers unfamiliar with EU sizes accidentally order the wrong pair.

Unlike athletic brands, Common Projects does not use half sizes. They offer full EU sizes only (e.g., 41, 42, 43).

That alone makes understanding the fit even more essential.

Do Common Projects Run Big or Small?

The short answer: Most people size down by one size from their typical sneaker size.

Here’s why:

• The last (shape of the shoe mold) runs slightly long.

• The silhouette is sleek and elongated.

• The leather stretches slightly after break-in.

For example:

• If you wear US 10 in Nike, you may prefer EU 42 instead of EU 43.

• If you’re between sizes, most buyers recommend sizing down.

However, this depends on foot shape.

Fit Characteristics Explained

1. Length

Common Projects sneakers, especially the Achilles Low, run slightly long. Many first-time buyers notice extra space in the toe box if they order their usual size.

That’s why sizing down often provides a more tailored fit.

2. Width

• Best for narrow to regular-width feet

• Can feel snug for wide feet

• No wide-width options available

The minimalist design means the shoe tapers slightly toward the toe. If you have wide feet, sizing down may feel too tight — in that case, staying true to size might be better.

3. Break-In Period

Common Projects sneakers are made from premium Italian leather. Out of the box, they may feel:

• Slightly stiff

• Firm around the heel

• Structured across the toe box

After a few wears, the leather softens and molds to your foot shape. This break-in process improves comfort significantly.

Common Projects Size Chart (EU to US Conversion)

Below is a general size conversion chart to help guide you:

⚠️ Important: This is a general guide. Individual fit may vary depending on foot shape.

Comparison With Popular Sneaker Brands

Common Projects vs Nike

Compared to Nike sneakers:

• Nike typically runs true to size.

• Common Projects usually run larger.

• Nike offers half sizes; Common Projects does not.

• Nike sneakers often have more cushioning and athletic padding.

If you wear US 10 in Nike:

• Many people choose EU 42 in Common Projects.

Common Projects vs Adidas

Compared to Adidas:

• Adidas sizing is usually true to size.

• Adidas often has slightly roomier toe boxes.

• Common Projects feel more structured and narrow.

If you wear US 9.5 in Adidas:

• You’ll likely choose EU 42 in Common Projects.

Common Projects vs Koio

Compared to Koio:

• Koio fits more true to size.

• Koio offers a slightly wider feel.

• Common Projects run longer and slimmer.

If you are between sizes:

• Koio → stay true to size

• Common Projects → consider sizing down

Common Projects vs Greats

Compared to Greats:

• Greats tend to run true to size.

• Slightly softer out of the box.

• Less break-in required.

Common Projects feel more tailored and structured in comparison.

How to Choose the Right Size (Step-by-Step)

Step 1: Measure Your Foot

Measure your foot length in centimeters. EU sizing is based primarily on foot length.

Step 2: Consider Your Width

• Narrow feet → Size down

• Regular feet → Usually size down

• Wide feet → Stay true to size

Step 3: Think About Socks

If you plan to wear:

• Thin no-show socks → Size down works well

• Thick socks → True to size may be better

Step 4: When in Doubt

If you are between sizes and have average-width feet, sizing down is generally safer.

Fit by Popular Models

Achilles Low

• Runs slightly large

• Most people size down

• Sleek, slim profile

Achilles High

• Similar fit to the Low

• Slightly snug around ankle initially

• Size down recommended for most

Chelsea Boots

• More structured

• True to size for most

• Consider regular size unless narrow foot

Are Common Projects Comfortable?

Comfort depends on expectations.

They are:

• Excellent for daily casual wear

• Supportive once broken in

• Not athletic or performance sneakers

The insole is relatively flat compared to sports brands. If you need arch support, you may want to use custom insoles.

Common Fit Mistakes to Avoid

1. Ordering your exact Nike size without checking EU conversion

2. Ignoring width considerations

3. Forgetting about the break-in period

4. Assuming luxury sneakers fit like running shoes

Final Verdict: How Do Common Projects Fit in 2026?

In 2026, the sizing remains consistent with previous years:

✅ Slightly long
✅ Best for narrow-to-regular feet
✅ Most buyers size down
✅ Break-in improves comfort

If you’re unsure and have average-width feet, sizing down one EU size from your typical athletic sneaker size is usually the safest choice.

FAQs About Common Projects Sizing

1. Do Common Projects run big or small?

They generally run slightly large. Most people size down one EU size.

2. Should I size down in Common Projects?

Yes, if you have narrow or regular-width feet. Wide-footed buyers may prefer true to size.

3. Are Common Projects true to size?

They are true to EU sizing standards but run larger compared to most athletic sneakers.

4. Do they stretch over time?

Yes. The Italian leather softens and molds to your foot after several wears.

5. Are they good for wide feet?

They are better suited for narrow to regular-width feet. Wide-footed buyers may find them snug.

6. Do Common Projects offer half sizes?

No. They only offer full EU sizes.

7. Is sizing the same across all models?

Most sneakers like the Achilles Low and High fit similarly, but boots may fit closer to true size.