Size Guide - Xero Shoes Aqua Sport
| Size | Inner length | Inner width |
| 40.5 | 21.1 | 9 |
| 41 | 25.4 | 9.1 |
| 41.5 | 25.8 | 9.2 |
| 42 | 26.1 | 9.3 |
| 42.5 | 26.5 | 9.4 |
| 43 | 27 | 9.5 |
| 43.5 | 27.5 | 9.6 |
| 44 | 28.2 | 10 |
| Size | Inner length | Inner width |
| 40.5 | 21.1 | 9 |
| 41 | 25.4 | 9.1 |
| 41.5 | 25.8 | 9.2 |
| 42 | 26.1 | 9.3 |
| 42.5 | 26.5 | 9.4 |
| 43 | 27 | 9.5 |
| 43.5 | 27.5 | 9.6 |
| 44 | 28.2 | 10 |