Bmx helmet suitable for men ladies sizes 51 55 cm 55 59 cm 59 63 cm us sizes s m l main colour green number of air vents 8 applications dirt all mountain park ride urban chin padding chin pad not inlcuded inner padding removable breathable washable size adjustment pads construction hardshell outer material abs weight 420 g inner material polystyrene eps helmet technologies giro superfit giro fit kit crash replacement