Original Short Mens
(measurements are in CM)
| UK Size | Insole Length | Max Calf Circumference | Boot Height |
| UK6 | 25.86 | 39.20 | 25.50 |
| UK7 | 26.70 | 39.90 | 25.50 |
| UK8 | 27.55 | 40.50 | 25.50 |
| UK9 | 28.40 | 41.20 | 27.50 |
| UK10 | 29.24 | 41.60 | 27.50 |
| UK11 | 30.09 | 42.00 | 27.50 |
| UK12 | 30.93 | 42.50 | 27.50 |
Universal Size
| EU Size | US Size | UK Size | JP Size | Insole | Mac Calf Area | Leg Height |
| 39 | 7 | 6 | 25 | 25.9-31.0 | 39.1 | 38.1 |
| 40/41 | 8 | 7 | 26 | 26.7 | 39.1 | 38.1 |
| 42 | 9 | 8 | 27 | 27.4 | 40.3 | 38.1 |
| 43 | 10 | 9 | 28 | 28.4 | 41.1 | 40.4 |
| 44 | 11 | 10 | 29 | 29.2 | 41.7 | 40.4 |
| 45/46 | 12 | 11 | 30 | 30.0 | 41.9 | 40.4 |
| 47 | 13 | 12 | 31 | 31 | 42.4 | 40.4 |