| EU | UK | US (unisex, man) | Mondopoint (mm) |
| 38 | 4 - 4.5 | 5 - 5.5 | 230 - 235 |
| 39 | 5 - 5.5 | 6 - 6.5 | 240 - 245 |
| 40 | 6 - 6.5 | 7 - 7.5 | 250 - 255 |
| 41 | 7 - 7.5 | 8 - 8.5 | 260 - 265 |
| 42 | 8 - 8.5 | 9 - 9.5 | 270 - 275 |
| 43 | 9 - 9.5 | 10 - 10.5 | 280 - 285 |
| 44 | 10 - 10.5 | 11 - 11.5 | 290 - 295 |
| 45 | 11 - 11.5 | 12 - 12.5 | 300 - 305 |
Size Chart for Them 909 Pat Ridder
