Mountain bike helmet suitable for men sizes 51 57 cm 54 60 cm 57 63 cm us sizes s m l main colour black surface matt number of air vents 24 applications all mountain enduro chin padding chin pad not inlcuded inner padding breathable removable visor with visor adjustable detachable size adjustments height adjustable wheel adjustment system headring strap adjustable features internal reinforcement construction in mold outer material polycarbon