| USA MEN'S | RED WING | EUROPEAN | BRITISH | MEN'S cm | USA WMNS |
| 6 | 5 | 38 | 5 | 24 | 7.5 |
| 6.5 | 5.5 | 38.5 | 5.5 | 24.5 | 8 |
| 7 | 6 | 39 | 6 | 25 | 8.5 |
| 7.5 | 6.5 | 39.5 | 6.5 | 25.5 | 9 |
| 8 | 7 | 40 | 7 | 26 | 9.5 |
| 8.5 | 7.5 | 41.5 | 7.5 | 26.5 | 10 |
| 9 | 8 | 42 | 8 | 27 | 10.5 |
| 9.5 | 8.5 | 42.5 | 8.5 | 27.5 | 11 |
| 10 | 9 | 43 | 9 | 28 | 11.5 |
| 10.5 | 9.5 | 43.5 | 9.5 | 28.5 | 12 |
| 11 | 10 | 44 | 10 | 29 | 12.5 |
| 11.5 | 10.5 | 44.5 | 10.5 | 29.5 | 13 |
| 12 | 11 | 45 | 11 | 30 | 14 |
| 13 | 12 | 46 | 12 | 31 | 15 |
| 14 | 13 | 47 | 13 | 32 | 16 |
$320 Size Guide
| USA MEN'S | RED WING | EUROPEAN | BRITISH | MEN'S cm | USA WMNS |
| 6 | 5 | 38 | 5 | 24 | 7.5 |
| 6.5 | 5.5 | 38.5 | 5.5 | 24.5 | 8 |
| 7 | 6 | 39 | 6 | 25 | 8.5 |
| 7.5 | 6.5 | 39.5 | 6.5 | 25.5 | 9 |
| 8 | 7 | 40 | 7 | 26 | 9.5 |
| 8.5 | 7.5 | 41.5 | 7.5 | 26.5 | 10 |
| 9 | 8 | 42 | 8 | 27 | 10.5 |
| 9.5 | 8.5 | 42.5 | 8.5 | 27.5 | 11 |
| 10 | 9 | 43 | 9 | 28 | 11.5 |
| 10.5 | 9.5 | 43.5 | 9.5 | 28.5 | 12 |
| 11 | 10 | 44 | 10 | 29 | 12.5 |
| 11.5 | 10.5 | 44.5 | 10.5 | 29.5 | 13 |
| 12 | 11 | 45 | 11 | 30 | 14 |
| 13 | 12 | 46 | 12 | 31 | 15 |
| 14 | 13 | 47 | 13 | 32 | 16 |
