The Alpha knee pad is made from breathable, perforated and durable Duratex neoprene with air cushioning for maximum comfort. The back of the pad consists of a two-layer Lycra design that is soft on the inside but strong and durable on the outside. To protect your knees from impacts, we use EVA foam under a hard nylon cap, with additional padding for lateral impacts. A Sharkskin neoprene interior ensures the pad stays firmly in place.