XTAK Knee PadsUnique X shaped thermal plastic urethane (TPU) shell EVA high density foam for superior shock absorption Lightweight TPU and Cordura nylon construction Forceful spring back action that gives you the protection you need Cool Max inner surface for wicking moisture away Anti skid inner surface to keep pad secured Spandex adjustable straps with Hatch Rapid Deployment Clips and hook & loop closure for secure fit The XTAK Knee Pads are extremely light and