Sierra Says:
The Red Hifi helmet is the most versatile in the line, meaning that it has no boundaries where you take it on the mountain. Further, ventilation and removal ear flaps helps you use this helmet throughout the entire season.
| Red Helmet Sizing Chart |  |
| HELMET SIZE CHART | XS | S | M | L | XL | XXL |
| Unisex | 53 - 55cm | 55 - 57cm | 57 - 59cm | 59 - 61cm | 61 - 63cm | 63 - 65cm |
| Women | 53 - 55cm | 55 - 57cm | 57 - 59cm | 59 - 61cm | * | * |
| Youth | * | 49 - 51cm | 51 - 53cm | 53 - 55cm | * | * |
| This is a guide to help with sizing. Your fit may vary. |
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