HJC RPHA 91 Solid Modular Motorcycle Helmet Size:S Bio-mechanical pivots on the inside

Bio-mechanical pivots on the inside and outside of the ankle for increased stability and support

enabling the helmet to be more easily removed from the head

Included cold weather ear covers with integrated speaker pockets to accommodate BlueTooth® communication system speakers (when used in 1/2 helmet Mode)

Size Head ( CM ) Head ( In ) Hat Size ( In ) XS 53-54 cm 20 7/8-21 1/4 6 5/8-6 3/4 S 55-56 cm 21 5/8-22 6 7/8-7 M 57-58 cm 22 1/2-22 6 7/8-7 L 59-60 cm 23 1/4-23 5/8 7 3/8-7 1/2 XL 61-62 cm 24-24 3/8 7 5/8-7 3/4 2XL 63-64 cm 24 3/4-25 1/8 7 7/8-8

Shoei RF-SR Helmet

HJC RPHA 91 Solid Modular Motorcycle Helmet Size:S Bio-mechanical pivots on the insideHJC RPHA 91 Solid Modular Motorcycle Helmet. The RPHA 91 is HJC's new modular touring helmet that was engineered for all day comfort. The new Premium Integrated Matrix EVO shell (P. I. M. EVO) provides enhanced shock resistant performance and is lightweight by using reinforcement materials that include carbon aramid, carbon fiber, glass fiber, organic non woven fabric, and linen fiber (natural fiber). The new distortion free, HJ 37 face shield and HJ