HJC RPHA 1N Helmet - Red Bull Austin GP MC-21SF Black/White/Red/Yellow. Designed developed after several years of focused efforts and crucial feedback from top world class athletes in MotoGP. HJC's top engineers went to work and created a race-bred helmet that is truly worthy of top race circuits around the world. The RPHA 1 is the very same model used by HJC's world-class athletes in both MotoGP and WorldSBK, and HJC is set to finally launch it into full production with FIM homologation (FRHPhe-01)-the safety certification. SPECIFICATIONS Sizing Size Cheek Pads Liner 2XS 53-54cm ...