Sizing guide (socks)
| UK Shoe Size (Men & Women) | EU Shoe Size | US (Men) | US (Women) |
| 4 – 7 | 37 – 41 | 5 – 8 | 6 – 9 |
| 8 – 11 | 42 – 46 | 9 – 12 | 10 – 13 |
True to Size: Base your selection on your standard running shoe size.
Between Sizes? If you are a UK 7.5, size down (to the 4–7) for a locked-in, aggressive compression fit. Size up (to the 8–11) if you prefer a slightly more relaxed midfoot over ultra-distances.
Unisex: Series 001 is anatomically engineered to stretch and conform securely to both male and female foot structures.
