Akona Seco dive boot sizing.
Women’s sizes
| Seco | US & CDN women's | UK women's | Europe women's |
|---|---|---|---|
| 5 | 6.5 | 4.5 | 38 |
| 6 | 7.5 | 5.5 | 39.5 |
| 7 | 8.5 | 6.5 | 40.5 |
| 8 | 9.5 | 7.5 | 41.5 |
| 9 | 10.5 | 8.5 | 42.5 |
| 10 | 11.5 | 9.5 | 44 |
| 11 | 12.5 | 10.5 | 45 |
Men’s sizes
| Seco | UK men's | Europe men's |
|---|---|---|
| 5 | 4.5 | 37.5 |
| 6 | 5.5 | 38.5 |
| 7 | 6.5 | 40 |
| 8 | 7.5 | 41.5 |
| 9 | 8.5 | 42.5 |
| 10 | 9.5 | 44 |
| 11 | 10.5 | 45.5 |
| 12 | 11.5 | 46 |
| 13 | 12.5 | 47 |
Source: Akona’s size chart (original chart).