More informationThe Icarus is our highest-end, most ventilated helmet. Good through-air flow, light weight and great fit in a compact package. It's one of the fastest helmets on the market. The 29 vents ensure a constant flow of air, while the PC-reinforced SpiderWeb structure offers optimum security when needed.clip-on aero shell for those looking for that little extra speed or to combat the cold.ACS design (Airflow Cooling System)Polycarbonate reinforced web structure.SpiderWeb internal reinforcement structure.High-density EPS foam.Invisible strap fasteners.Rear ventilation holes for optimal air circulation.Ultra-light straps for a perfect, comfortable fit.x000D_Multi-angle strap dividers.x000D_Omega adjustment system, adjustable height and width.x000D_Internal foams designed for optimal air circulation.x000D_AirFlow Cooling SystemVentilation holes 29Size M 52-55cmDouble In-mold shell . Gama: L