AGV K3 Adult Dreamtime Helmet Street Motorcycle Helmet - White/Orange/Blue / Medium/Large HIR-TH (High Resistance Thermoplastic Resin) shell construction 4 EPS sizes optimized using the FEM (Finite Dreamtime Analysis) system Ventilation system was designed and optimized in a wind tunnel GT 2 scratch-resistant, anti-fog polycarbonate face shield Face shield mechanism features PVS (Perimetrical Visor Seal) for improved seal