| Size | UK Men | UK Women | EU | US Men | US Women |
| Small | 2.5 - 5 | 3.5 - 5 | 34.5 - 37.5 | 3 - 5.5 | 5 - 6.5 |
| Medium | 5.5 - 7 | 6 - 7.5 | 38 - 40 | 6 - 7.5 | 7 - 8.5 |
| Large | 7.5 - 9 | 8 - 9.5 | 40.5 - 42.5 | 8 - 9.5 | 9 - 10.5 |
| X Large | 9.5 - 11 | 10 - 11.5 | 43 - 45 | 10 - 11.5 | 11 - 12.5 |
| Size | UK Men | UK Women | EU | US Men | US Women |
| Small | 2.5 - 5 | 3.5 - 5 | 34.5 - 37.5 | 3 - 5.5 | 5 - 6.5 |
| Medium | 5.5 - 7 | 6 - 7.5 | 38 - 40 | 6 - 7.5 | 7 - 8.5 |
| Large | 7.5 - 9 | 8 - 9.5 | 40.5 - 42.5 | 8 - 9.5 | 9 - 10.5 |
| X Large | 9.5 - 11 | 10 - 11.5 | 43 - 45 | 10 - 11.5 | 11 - 12.5 |