| Helmet Size | Head Measurement (Inches) |
| XX-Small | 20" - 20-1/2" |
| X-Small | 20-1/2" - 21-1/4" |
| Small | 21-1/4" - 22" |
| Medium | 22" - 23" |
| Large | 23" - 23-3/4" |
| X-Large | 23-3/4" - 24-1/2" |
| XX-Large | 24-1/2" - 25-1/4" |
| Helmet Size | Head Measurement (Inches) |
| XX-Small | 20" - 20-1/2" |
| X-Small | 20-1/2" - 21-1/4" |
| Small | 21-1/4" - 22" |
| Medium | 22" - 23" |
| Large | 23" - 23-3/4" |
| X-Large | 23-3/4" - 24-1/2" |
| XX-Large | 24-1/2" - 25-1/4" |