Shell Adopt the structurally enhanced PC/ABS material, which has the feature of strong vibration-resistant of and high anti-impact Ability Surface is painted with imported material, which is with brilliance color, hard to color fade Cushion layer With the innocuous material of high ability to absorb the impact The appropriate shape & size is suitable for wearing Extraordinarily comfortable whole inner liner With the comfortable harmless material, featuring of absorbing perspiration, Good ventilation system helps prevent fogging and also makes the helmet's interior more comfortable. Specification: S(540 to 560mm),M(560 to 580mm),L(580 to 600mm) Face shield Visible light permeate rate more than 85% High anti-impact ability, anti-scratch, anti-fog high optics shield Wearing set: Adjustable chin strap and standard clip, guarantee the comfortable & firm ware, and easy to take off