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The helmet size chart below is specifically for HJC helmets for adults:
| Model / Size | XXS | XS | S | M | L | XL | XXL |
| RPHA Series | 54 - 55 | 55 - 56 | 57 - 58 | 58 - 59 | 60 - 61 | 62 - 63 | |
| FG-Jet | 54 - 55 | 55 - 56 | 57 - 58 | 58 - 59 | 60 - 61 | 62 - 63 | |
| CL-17 & CL-17 Plus | 54 - 55 | 56 - 57 | 58 - 59 | 60 - 61 | 62 - 63 | 63 - 64 | |
| All other models | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | 61 - 62 | 63 - 64 |
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A supreme sport-touring helmet designed for any ride from quick commutes to cross-country cruises. The RPHA 70 is exceptionally compact and lightweight as a result of the Premium Integrated Matrix (P.I.M. Plus) shell that provides enhanced shock-resistance with reinforcement materials that include carbon and carbon-glass hybrid fabric.
