Size guide.
Find your perfect fit.
Footwear and apparel sizing for men, women and kids, plus how to measure at home. Between sizes? We always recommend sizing up for running shoes.
01. Men's Footwear
US sizing shown. Running and training shoes run true to size — if you're between sizes, size up half a size.
| US | UK | EU | CM |
|---|---|---|---|
| 7 | 6 | 40 | 25 |
| 8 | 7 | 41 | 26 |
| 9 | 8 | 42.5 | 27 |
| 10 | 9 | 44 | 28 |
| 11 | 10 | 45 | 29 |
| 12 | 11 | 46 | 30 |
02. Women's Footwear
US sizing shown. Trail and court shoes run slightly narrow — consider sizing up if you have a wider foot.
| US | UK | EU | CM |
|---|---|---|---|
| 5 | 2.5 | 35.5 | 22 |
| 6 | 3.5 | 36.5 | 23 |
| 7 | 4.5 | 38 | 24 |
| 8 | 5.5 | 39 | 25 |
| 9 | 6.5 | 40.5 | 26 |
| 10 | 7.5 | 42 | 27 |
03. Kids' Footwear
Kids' feet grow fast — we recommend leaving a thumb's width of space at the toe. Sizes below are US youth.
| US Youth | UK | EU | CM |
|---|---|---|---|
| 1Y | 13 | 32 | 19.5 |
| 2Y | 1 | 33.5 | 21 |
| 3Y | 2 | 35 | 22 |
| 4Y | 3 | 36 | 23 |
| 5Y | 4 | 37 | 24 |
04. Apparel Sizing
Tees, shorts, leggings and jackets run true to standard US sizing (XS–XXL). Compression gear (like the Air Volt tights) fits close to the body — size up if you prefer a relaxed fit.
Ordered the wrong size? Exchanges are always free — no shipping fee either way. See our Returns & Exchanges page.
05. How to Measure at Home
Feet: Stand on a sheet of paper, trace your foot, measure heel to longest toe in centimeters, then match to the CM column above. Measure both feet — use the larger one.
Chest/Bust: Wrap tape around the fullest part of your chest, keeping the tape level.
Waist: Measure around your natural waistline, just above the belly button.
06. Still Unsure?
Email us a few details — your usual size in other brands, foot width, and what you're shopping for — and our team will recommend a size before you order. We reply fast, usually same day.
Ready to shop?
Now that you know your size, go find your fit.
