| Helmet Size | Centimeters | Head Circumference | Hat Size |
| X-Small | 53 - 54 cm | 20 3/4" | 6 1/2" - 6 5/8" |
| Small | 55 - 56 cm | 21 1/4" | 6 3/4" - 6 7/8" |
| Medium | 57 - 58 cm | 22 3/8" | 7" - 7 1/8" |
| Large | 59 - 60 cm | 23 1/8" | 7 1/4" - 7 3/8" |
| X-Large | 61 - 62 cm | 23 5/8" | 7 1/2" - 7 5/8" |
| 2X-Large | 63 - 64 cm | 24" | 7 3/4" - 7 7/8" |
| 3X-Large | 65 - 66 cm | 24 3/8" | 8" - 8 1/8" |
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