Helmet Sizing
| Size | XS | S | M | L | XL | XXL | XXXL |
| hat | 6 1/2 - 6 5/8 | 6 3/4 - 6 7/8 | 7 - 7 1/8 | 7 1/4 - 7 3/8 | 7 1/2 - 7 5/8 | 7 3/4 - 7 7/8 | 8- 8 1/8 |
| circumference | 53-54 cm | 55-56 cm | 57-58 cm | 59-60 cm | 61-62 cm | 63-64 cm | 65-66 cm |
| 20 1/4 - 20 7/8" | 21 - 21 5/8" | 21 3/4 - 22 3/8" | 22 1/2 - 23 1/8" | 23 1/4 - 24" | 24 1/8 - 24 7/8" | 25 - 25 5/8" |