The Troy Lee Designs Stage Knee Guards offer mid-range protection for heading out to the bike park in confidence. D30® is used for impact protection. It D30® is a soft and flexible guard that is comfortable while riding but hardens on impact to disperse energy and keep you protected.Troy Lee Designs Stage Knee Guards FeaturesPackable trail protectionFitlock compression calveSlide resistant exterior kneecapBreathable and wicking chassisArticulated for optimal pedallingMesh rear panel for ventilationHoneycomb Silicone leg gripperCE EN1621-1 certified D30 impact pad