HJC RPHA 11 Pro Aliens Helmet
Originally built for the racetrack, the RPHA 11 Pro is HJC’s premium sport helmet, designed with an aerodynamic shell structure for extreme performance at maximum speeds. The Premium Integrated Matrix (P.I.M Plus) shell composition provides enhanced shock-resistant performance and a more comfortable and lightweight helmet using reinforcement materials that include carbon and carbon-glass hybrid fabric. The features cater to sport riders with an enlarged eye port for an increased view in a tucked position and an outstanding airflow ventilation system. Additional safety features include reflective patches on the rear neck area and an emergency release cheek pad system for safe and quick helmet removal in an emergency situation.
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Sizing Information
Below is a size chart provided by HJC for this product. If you need help with how to measure, or how to evaluate the fit of a helmet please have a look at this guide by HJC (the size chart included in this guide is for a “generic” HJC helmet and may differ slightly from the chart below that is specific to this product).
If you have questions about how this helmet might fit as compared to other helmets in your closet, please visit this FAQ for some advice.
| Helmet Size | Hat Size | Head Measurement (inches) | Head Measurement (cm) |
|---|---|---|---|
| XS | 6 3/4 to 6 7/8 | 21 1/4 to 21 5/8 | 54 to 55 |
| Small | 6 7/8 to 7 | 21 5/8 to 22 | 55 to 56 |
| Medium | 7 1/8 to 7 1/4 | 22 1/2 to 22 7/8 | 57 to 58 |
| Large | 7 1/4 to 7 3/8 | 22 7/8 to 23 1/4 | 58 to 59 |
| XL | 7 1/2 to 7 5/8 | 23 5/8 to 24 | 60 to 61 |
| XXL | 7 3/4 to 7 7/8 | 24 3/8 to 24 3/4 | 62 to 63 |
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