Size Guide | K2 Helmets
| Measurement | Circumference (cm) |
| XS | 48-51 |
| S/ Youth | 51-55 |
| M | 55-59 |
| L / XL | 59-62 |
| Measurement | Circumference (cm) |
| XS | 48-51 |
| S/ Youth | 51-55 |
| M | 55-59 |
| L / XL | 59-62 |
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