Full face bike helmet mountain bike helmet suitable for men ladies sizes 52 56 cm 55 59 cm 58 62 cm us sizes s m l main colour green number of air vents 23 applications enduro mtb downhill safety features mips brain protection system chin padding chin pad not inlcuded inner padding antibacterial breathable removable washable visor with visor screw assembly size adjustments wheel adjustment system strap adjustable features neck protection chin gu