The Echo knee pad is made from a super tough Cordura outer material with an air cushion lining for maximum comfort. The back of the pad is a two-layer Lycra design that is soft on the inside but strong and durable on the outside. To protect your knees from impact, we use SAS-TEC, a soft and flexible visoelastic foam for superior comfort but also extreme shock absorption. A Sharkskin neoprene interior and dual strap design ensure the pad stays firmly in place.