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HJC Helmet Sizing Chart
| Helmet Size | Centimeter | Hat Size | Inches |
| XXS | 51-52 | 6 3/8 - 6 1/2 | 20- 20 1/2 |
| XS | 53-54 | 6 5/8 - 6 3/4 | 20 7/8 - 21 1/4 |
| Small | 55-56 | 6 7/8 - 7 | 21 5/8 - 22 |
| Medium | 57-58 | 7 1/8 - 7 1/4 | 22 1/2 - 22 7/8 |
| Large | 59-60 | 7 3/8 - 7 1/2 | 23 1/4 - 23 5/8 |
| Extra Large | 61-62 | 7 5/8 - 7 3/4 | 24 - 24 3/8 |
| XX-Large | 63-64 | 7 7/8 - 8 | 24 3/4 - 25 1/4 |
| XXX-Large | 65-66 | 8 1/8 - 8 1/4 | 25 5/8 - 26 |
| XXXX-Large | 67-68 | 8 3/8 - 8 1/2 | 26 3/8 - 26 3/4 |
| XXXXX-Large | 69-70 | 8 3/4 - 8 3/4 | 27 1/4 - 27 5/8 |
