| SIZE | Inches | Centimeters | Hat Size |
| XS | 20 7/8 - 21 1/4 | 54-55 | 6 3/4 - 6 7/8 |
| S | 21 5/8 - 22 | 56-57 | 7 - 7 1/8 |
| M | 22 1/2 - 22 7/8 | 58-59 | 7 1/4 - 7 3/8 |
| L | 23 1/4 - 23 5/8 | 60-61 | 7 1/2 - 7 5/8 |
| XL | 24 - 24 3/8 | 62-63 | 7 3/4 - 7 7/8 |
| 2XL | 24 3/4 - 25 1/4 | 63-64 | 7 7/8 - 8 |
| 3XL | 25 5/8 - 26 | 65-66 | 8 1/8 - 8 1/4 |
| 4XL | 26 3/8 - 26 3/4 | 67-68 | 8 3/8 - 8 1/2 |
| 5XL | 27 1/4 - 27 5/8 | 69-70 | 8 3/4 - 8 3/4 |
HJC CL-17 Series Helmets
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