Race cycling helmet mountain bike helmet suitable for men sizes 51 55 cm 55 59 cm 59 63 cm us sizes s m l main colour black surface matt number of air vents 21 applications race road chin padding chin pad not inlcuded inner padding antibacterial breathable removable washable size adjustments wheel adjustment system strap adjustable features enhanced protection for back of head carbon reinforcement construction in mold outer material polycarbona