Bmx helmet mountain bike helmet suitable for ladies men sizes 51 54 cm 55 58 cm 59 62 cm us sizes xss ml xlxxl main colour white surface shiny applications dirt all mountain safety features mips brain protection system chin padding chin pad not inlcuded inner padding removable visor without visor size adjustments double slide system strap adjustable construction in mold outer material polycarbonate weight 420 g inner material polystyrene