The Fly Kinetic Crux helmet is made from a poly-alloy shell - a combination of high-strength poly materials that creates a durable, lightweight shell. It boasts a dual-density EPS liner with two layers of EPS (Expanded Polystyrene), one softer one slightly harder, combining to provide more progressive impact absorption. The removable liner and cheek pads are washable and easy to use with a quick-snap system. Ten vents aligned with EPS (Expanded Polystyrene) channels flow a huge volume of air through the helmet keeping you cool with large exhaust vents to eliminate heat that builds up.