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| SIZE | HEAD MEASURES (IN) | HEAD MEASURES (CM) | HAT |
| X-SMALL | 20.9" - 21.3" | 53cm - 54cm | 6 1/2" - 6 5/8" |
| SMALL | 21.7" - 22" | 55cm - 56cm | 6 3/4" - 6 7/8" |
| MEDIUM | 22.4" - 22.8" | 57cm - 58cm | 7" - 7 1/8" |
| LARGE | 23.2" - 23.6" | 59cm - 60cm | 7 1/4" - 7 3/8" |
| X-LARGE | 24" - 24.4" | 61cm - 62cm | 7 1/2" - 7 5/8" |
| 2X-LARGE | 24.8" - 25.2" | 63cm - 64cm | 7 3/4" - 7 7/8" |
MSR Adult Helmets Sizing Chart
Adult Helmets (measure around the head just above the ears and across the forehead)