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| Specialized Helmet Sizing | Hat Size | Circumference in inches | European Sizing |
|---|---|---|---|
| XS - Extra Small | 6 3/8 - 6 3/4 | 20" - 21 1/4" | 51 - 54 cm |
| S - Small | 6 5/8 - 7 | 21" - 22" | 53 - 56 cm |
| M - Medium | 6 7/8 - 7 1/4 | 21 3/4" - 22 3/4" | 55 - 58 cm |
| L - Large | 7 1/8 - 7 5/8 | 22 1/2" - 24" | 57 - 61 cm |
| XL - Extra Large | 7 1/2 - 7 7/8 | 23 5/8" - 24 3/4" | 60 - 63 cm |
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