Please note:
The size shown in the "Select Size" dropdown is Wild Bird Society of Japan's unique sizing. These are guidelines and we cannot guarantee a specific size will fit.
| WBSJ Sizing | Women's US Sizing | Men's US Sizing | JP Sizing |
| XS | 5 - 6 | 3.5 - 4.5 | 22 - 23 cm |
| S | 6.5 - 7 | 5 - 5.5 | 23.5 - 24 cm |
| M | 7.5 - 8 | 6 - 6.5 | 24.5 - 25 cm |
| L | 8.5 - 9 | 7 - 7.5 | 25.5 - 26 cm |
| XL | 9.5 - 10.5 | 8 - 8.5 | 26.5 - 27 cm |