Bell Vortex Unisex-Adult Full Face Street Helmet (Rsd Dyna, X-Large) (D.O.T.-Certified) Lightweight Polycarbonate/ABS Shell Construction. Velocity Flow Ventilation system with Flow Adjust. Click Release Shield for fast, easy and tool-free shield replacement NutraFog II anti-fog, anti-scratch and UV protected shield. Padded Wind Collar drastically reduces wind and road noise Contoured cheek pads. Removable/washable interior. Integrated speaker pockets. Padded chin strap with D-ring closure Industry-leading Five-year warranty