Product_description: ["Lightweight multi-ply Matrix AIM (Advanced Integrated Matrix) shell construction Shell is compact and aerodynamic, with attention towards wind noise reduction without blocking road noises Smaller, lighter yet stronger shell design Four shell sizes ensure a custom fit Dual density EPS (Expanded Polystyrene) liner accommodates a more compact design without compromising ventilation flow 3D MaxDry System II liner material quickly absorbs and dissipates sweat and moisture Center pad components are three dimensionally shaped to match contours of the rider's head, allowing a�comfortable fit while maintaining a firm hold for high speed riding Emergency Quick Release System (E.Q.R.S.) allows emergency medical personnel to easily remove cheek pads from an injured rider's helmet Superior ventilation as a result of rigorous wind tunnel testing Large three position lower vent, three upper vent intakes, and four uniquely positioned upper exhaust outlet vents Chin curtain and breath guard included Shield features ribs along the top and bottom to improve rigidity and eliminate bending from wind pressure during opening and closing Improved window beading features dual layered dual lip construction that ensures a windproof and waterproof seal with every closure Locking mechanism easily engages the shield lock when fully closed Pinlock pins and EVO fog resistant lens insert included Spring loaded base plates offer quick shield changes Five stage rotating dial allows fine"] (Page 1)