Mountain bike helmet suitable for men ladies sizes 52 57 cm 57 62 cm 59 64 cm main colours black white number of air vents 25 application all mountain chin padding with chin pad inner padding antibacterial breathable removable washable visor with visor size adjustments wheel adjustment system headring strap adjustable features lower edge reinforcement construction in mold weight 250 g inner material polystyrene eps helmet technologies alpina