Pro Tec Skateboarding Helmet Size Chart
| HEAD MEASUREMENT | SIZE |
| 52 CM - 54 CM / 20.5 - 21.3" | XS |
| 54 CM - 56 CM / 21.3 - 22" | S |
| 56 CM - 58 CM / 22 - 22.8" | M |
| 58 CM - 60 CM / 22.8 - 23.6" | L |
| 60 CM - 62 CM / 23.6 - 24.4" | XL |
| 62 CM - 64 CM / 24.4 - 25.2" | XXL |
| HEAD MEASUREMENT | SIZE |
| 52 CM - 54 CM / 20.5 - 21.3" | XS |
| 54 CM - 56 CM / 21.3 - 22" | S |
| 56 CM - 58 CM / 22 - 22.8" | M |
| 58 CM - 60 CM / 22.8 - 23.6" | L |
| 60 CM - 62 CM / 23.6 - 24.4" | XL |
| 62 CM - 64 CM / 24.4 - 25.2" | XXL |