Support · Size guide
Find your size.One letter. Both feet.
COOPS use letter sizes so one pair fits a range.COOPS run 5XS to 5XL. Each letter spans two US sizes, so find the fit you normally buy and read across.
Size chart
Full chart
COOPS come in letter sizes, and each letter covers two US sizes, so half sizes are already handled.
Find your usual US number below and order that letter.
| COOPS sizeSize | Women’s US | Men’s US | EU | Foot (cm) | Foot (in) |
|---|---|---|---|---|---|
| 5XS | 5–5.5 | — | 35–35.5 | 21.6–22.0 | 8.5–8.7 |
| 4XS | 6–6.5 | 4.5–5 | 36–37 | 22.4–22.9 | 8.8–9.0 |
| 3XS | 7–7.5 | 5.5–6 | 37.5–38 | 23.3–23.7 | 9.2–9.3 |
| 2XS | 8–8.5 | 6.5–7 | 38.5–39 | 24.1–24.6 | 9.5–9.7 |
| XS | 9–9.5 | 7.5–8 | 39.5–40 | 25.0–25.4 | 9.8–10.0 |
| S | 10–10.5 | 8.5–9 | 40.5–41 | 25.8–26.2 | 10.2–10.3 |
| M | 11–11.5 | 9.5–10 | 41.5–42 | 26.7–27.1 | 10.5–10.7 |
| L | 12 | 10.5–11 | 42.5–43 | 27.5–27.9 | 10.8–11.0 |
| XL | — | 11.5–12 | 44–44.5 | 28.4–28.8 | 11.2–11.3 |
| 2XL | — | 12.5–13 | 45–46 | 29.2–29.6 | 11.5–11.7 |
| 3XL | — | 13.5–14 | 46.5–47 | 30.0–30.5 | 11.8–12.0 |
| 4XL | — | 14.5–15 | 47.5–48 | 30.9–31.3 | 12.2–12.3 |
| 5XL | — | 15.5–16 | 48.5–49 | 31.8–32.2 | 12.5–12.7 |
Each letter spans two US sizes, a US 10 and a 10.5 are both a women’s S. Between sizes? Take the larger letter. Wide feet? Go one letter up.
Measure in 30 seconds
- Stand on paper against a wall Heel touching the wall, wearing the socks you’d normally wear.
- Mark your longest toe It isn’t always the big toe. Keep the pencil vertical.
- Measure wall to mark Do both feet and use the longer one against the chart.
Fit notes from 2,500+ buyers
- Ordered true to size89%
- Size up for wide feet3%
High top or low top, your COOPS size stays the same.
- How they should fitSnug like a sock, with room to spread your toes. A little tight out of the box is normal, and the knit molds to your foot after a few wears.
- Measure at the end of the dayFeet swell. The size that fits at 6pm is the size that fits all day.
- Between two letters?Choose the larger one. Each letter spans two US sizes; the larger letter keeps your toes free while the four-way stretch knit holds the fit snug.
- Wide feetChoose one COOPS letter size larger than your usual letter. The knit gives across the forefoot, and the extra letter stops it pressing.