Full face bike helmet mountain bike helmet suitable for men sizes 53 54 cm 55 56 cm 57 58 cm 59 60 cm 61 cm us sizes xs s m l xl main colour white secondary colours orange gold safety features mips brain protection system fly net visor with visor features chin ventilation neck protection forehead ventilation cheek padding chin guard outer materials carbon kevlar weight 900 g helmet technology double d ring strap