| Origin Base | S | M | L |
| US Boots | 3.5 - 7 | 7 - 10 | 9-12 |
| US Women Boots | 5 - 8.5 | 8.5 - 11.5 | 10.5+ |
| Euro Boots | 35.5 - 39 | 39 - 43 | 43 - 46 |
| UK Boots | 2.5 - 6 | 6-9 | 9-13 |
| Japan Boots | 21.5 - 25 | 25 - 28 | 27 - 30 |
| Aeron Base | XS - M | M - XL | |
| US Boots | 3.5 - 8.5 | 8 - 14 | |
| US Womens Boots | 5 - 10 | 9.5+ | |
| Euro Boots | 35.5 - 41.5 | 41 - 48 | |
| UK Boots | 2.5 - 7.5 | 7 - 13 | |
| Japan Boots | 21.5 - 26.5 | 26 - 32 |