City helmet suitable for men ladies sizes 52 57 cm 57 62 cm main colour white number of air vents 23 applications urban touring safety features fly net chin padding with chin pad inner padding removable washable visor with visor size adjustments wheel adjustment system headring strap adjustable construction in mold weight 255 g inner material polystyrene eps helmet technologies alpina ceramic shell alpina hi eps alpina run system alpina shie