The Alpha knee pad is constructed from a breathable perforated and tougher Duratex neoprene with air plush lining for maximum comfort. The back side of the pad uses a dual layer Lycra design, that is soft on the inside but strong and durable on the outside. To protect your knees from impact we use EVA foam under a nylon hard cap, with additional padding for side impacts. A Sharkskin neoprene inner section ensures the pad stays firmly in place. Features Breathable perforated neoprene with air plush lining, back side with dual layer Lycra, soft inner durable outer and EVA foam padding under nylon hard cap.