Description
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.
Size Chart For Helmets
How to measure the size of your head
First, measure the circumference of your head with a measuring tape.
Measure from the highest point of your forehead, just above your eyebrows, horizontally backwards to the highest point of the back of your head and around.
Based on the measurement, choose the size from the table below.
However, unlike hats, helmets cannot be sized by head circumference alone.
Also, helmets of the same manufacturer may feel different even if they are the same size depending on the model.
| Ordering Size | XS | S | M | L | XL | 2XL |
| Head Measurement (cm) | 53 – 54 cm | 55 – 56 cm | 57 – 58 cm | 59 – 60 cm | 61 – 62 cm | 63 – 64 cm |
* This universal size chart is for reference only. Sizes vary by manufacturer and product.
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