Mountain bike helmet suitable for men sizes 51 54 cm 55 58 cm 59 62 cm us sizes xss ml xlxxl main colour black number of air vents 16 applications all mountain enduro visor with visor screw assembly painted size adjustment headring features neck protection construction in mold outer material polycarbonate weight 340 g inner material polystyrene eps marks of approval en din 1078 cpsc as