Sizing Chart Bauer 5100 Helmet
| Helmet Size | Hat Size | Circumference (in.) | Circumference (cm.) |
| X-Small | 6 1/8 - 6 3/4 | 19.2" - 21.2" | 49 - 54 |
| Small | 6 1/2 - 7 1/8 | 20.4" - 22.4" | 52 - 57 |
| Medium | 6 7/8 - 7 1/2 | 21.6" - 23.6" | 55 - 60 |
| Large | 7 1/4 - 7 7/8 | 22.8" - 24.8" | 58 - 63 |
| X-Large | 7 1/2 - 8 1/8 | 23.6" - 25.6" | 60 - 65 |