Constructed with advanced thermo-poly alloy (A.T.P.A.*), the SS2400 helmet delivers a strong yet lightweight outer shell, with an AirStrike* direct course ventilation system to promote maximum airflow and cooling. For added safety, the Lockdown* shield lock security system ensures the face shield stays securely in place. The DVD* drop visor design provides on-demand sun protection, while the optically correct, anti-scratch face shield offers clear, undistorted vision and optimum closure. Inside, a removable, washable liner keeps you fresh with its moisture-wicking, hypoallergenic materials.