These Comfort Knees pads have an extra thick polyurethane skin coating on the kneeling surfaces for increased durability. The polyurethane skin also helps to prevent build-up of sharp items such as splinters that can scratch floors. Comfort Knees are designed for floor installation. They provide protection for both kneeling or knee kicking, and can stay on at all times. The extra wide straps won't pinch your legs. The contour conforms to the motion of your knee. Made from flexible yet durable neoprene material, these pads are machine-washable. Inner knee pad is replaceable. Net weight: 1 lb./set.