High Boot size guide
| Rubber boot River | Thermo boot Mason | Insole length (CM) | Insole length (Inch) | Height of shaft (CM) | Height of shaft (Inch) | EUR size | UK size | US size | |
| 143 | 5 5/8 | 15.5 | 6 1/8 | 22 | 6 | 6.5 | |||
| 151 | 6 | 15.5 | 6 1/8 | 23 | 7 | 7.5 | |||
| 158 | 6 1/4 | 18.5 | 7 3/8 | 24 | 8 | 8.5 | |||
| 165 | 6 1/2 | 18.5 | 7 3/8 | 25 | 8.5 | 9 | |||
| 171 | 6 3/4 | 18.5 | 7 3/8 | 26 | 9 | 9.5 | |||
| 178 | 7 | 18.5 | 7 3/8 | 27 | 10 | 10.5 | |||
| 185 | 7 3/8 | 20.5 | 8 1/8 | 28 | 11 | 11.5 | |||
| 191 | 7 1/2 | 20.5 | 8 1/8 | 29 | 11.5 | 12 | |||
| 197 | 7 3/4 | 20.5 | 8 1/8 | 30 | 12 | 12.5 | |||
| 204 | 8 | 20.5 | 8 1/8 | 31 | 13 | 13.5 | |||
| 212 | 8 3/8 | 22.5 | 8 7/8 | 32 | 13.5 | 1 | |||
| 217 | 8 5/8 | 22.5 | 8 7/8 | 33 | 1 | 1.5 | |||
| 225 | 8 7/8 | 22.5 | 8 7/8 | 34 | 2 | 2.5 | |||
| 230 | 9 | 22.5 | 8 7/8 | 35 | 2.5 | 3 |
