NW Chelsea Mens
(measurements are in CM)
| UK Size | Max Calf Circumference | Topline Circumference | Boot Height |
| UK6 | 269/130 | 250.00 | 145.00 |
| UK7 | 276/130 | 258.00 | 145.00 |
| UK8 | 283/135 | 266.00 | 150.00 |
| UK9 | 290/135 | 274.00 | 150.00 |
| UK10 | 297/145 | 282.00 | 160.00 |
| UK11 | 304/145 | 290.00 | 160.00 |
| UK12 | 311/150 | 298.00 | 165.00 |
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 |