The LS2 Challenger GT is the most technically advanced touring helmet LS2 has ever built. The shell is made from a pre-preg matrix of materials called "HPFC." The matrix is a proprietary blend of materials including fiberglass. HPFC is extremely light weight. LS2 uses lasers to shape every vent hole in the shell. The hole tolerances are so tight that we don't use glue to adhere any of the venting or gaskets. LS2 double injects the material in the eye port gasket to create the best possible seal. The Challenger GT shield is the thickest (3MM) Class "A" optically correct on the market. The shield covers the largest eye port in the industry, which provides the best possible field of view. The Venturi vents on the top rear chimney are active, which means they can be opened or closed depending on the rider's desire. The shell meets and exceeds both DOT & ECE certification standards.