These knee pads are made of 100% washable neoprene and have an extra large super-soft contoured 3/4″ thick foam rubber insert pad for greater comfort. The front of this knee pad and strap is covered with tough leather for increased durability and will not mark or scratch floors. Quick and easy on/off using the single 3″ wide front fastening Vecro strap. Nonbinding straps fit below the knee and prevent chafing, allowing these knee pads to be worn with shorts. And will keep your knees warm in the winter.