If your foot length is foot 22 to 24 cm (US 4 to 6.5), go with S socks. Sock sizes map to your shoe size, which comes from foot length. A good sock hugs the arch without bunching at the toe or heel.
| Your foot length | Recommended size |
|---|---|
| foot under 22 cm (US under 4) | Kids / XS |
| foot 22 to 24 cm (US 4 to 6.5) | S socks |
| foot 24 to 26.5 cm (US 6.5 to 9) | M socks |
| foot 26.5 to 28.5 cm (US 9 to 11.5) | L socks |
| foot 28.5 cm and up (US 11.5 and up) | XL socks |
| Between two bands | Size down for a snug athletic fit. |
| Cushioned / hiking socks | Bulk runs larger — stay true to size. |
| Compression socks | Follow the brand chart by foot and calf. |