HJC RPHA 31 Solid Open Face Motorcycle Helmet

HJC RPHA 31 Solid Open Face Motorcycle Helmet. The RPHA 31 offers enhanced shock resistance and maximum protection thanks to its Premium Integrated Matrix (PIM) Evo shell and multi-density EPS. Engineered for a quieter, more aerodynamic ride through extensive wind-tunnel testing, the sun-visor-equipped RPHA 31 decreases noise level and wind turbulence. The RPHA 31 will also accept the second generation of SMART HJC Bluetooth communication systems, allowing riders to stay connected and focused on the road ahead. Features P.I.M. (Premium Integrated Matrix Plus) EVO shell Areodynamic design generates down force for high stability and less drag Ventilation system offers bypass air channel and maximum air intake Distortion-free HJ-39 shield provides clear and wide view Shield deflector lowers noise level and blocks incoming wind Shield holder secures the shield and reduces noise and air drag HJ-V12 3-step integrated sunshield is adjustable for optimized position Interchangeable cheek pads feature grooves to accommodate eyeglasses 2-way pivot ratchet system offers smooth movement and improved sealing 2nd generation Smart HJC Bluetooth® ready Sizing Wrap a tape measure horizontally around your forehead. Select the helmet that is the closest fit to that size. A helmet should fit snug on your head. If it moves while wearing, it is too large. If it is painful to wear, it is too small. Size Chart Size CM: Hat Size Inches 2XS 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 S 55-56 6 7/8 - 7 21 5/8 - 22 M 57-58 7 1/8 - 7 1/4 22 1/2 - 22 7/8 L 59-60 7 3/8 - 7 1/2 23 1/4 - 23 5/8 XL 61-62 7 5/8 - 7 3/4 24 - 24 3/8 2XL 63-64 7 7/8 - 8 24 3/4 - 25 1/4 3XL 65-66 8 1/8 - 8 1/4 25 5/8 - 26 4XL 67-68 8 3/8 - 8 1/2 26 3/8 - 26 3/4 5XL 69-70 8 3/4 - 8 3/4 27 1/4 - 27 5/8