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Measure your ankle circumference at the narrowest point.
| Men's | Women's | |||
| Size | Instep Circumference | Shoe Size | Instep Circumference | Shoe Size |
| 2 | - | - | 8-9.25 in / 20.5-23.5 cm | 4.5-6.5 |
| 3 | 9.25-10.5 in / 23.5-26.5 cm | 7-10 | 8.5-10 in / 22-25 cm | 6.5-8.5 |
| 4 | 10-11 in / 25-28 cm | 10.5-12 | 9.25 - 10.5 in / 23.5 - 26.5 cm | 8.5-11 |
| 5 | 10.5-11.5 in / 26.5-29.5 cm | 12.5-15 | - | - |
