Fly Racing 73-3480L Kinetic Racing Helmet Poly alloy shell is crafted with a combination of high strength poly materials to create a durable light weight shell Removable liner & cheek pads keep you looking clean, help extend the life of your helmet and are easy to use with our Quick Snap system Hi-Flow mouthpiece with plenty of air flow DOT approved certification Hi-Flow mouthpiece with plenty of air flow Dual density EPS liner has two layers of EPS (Expanded Polystyrene), one softer, one slightly harder, that combine to provide more progressive impact absorption for different levels of impact