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The polyurethane skin on the kneeling surfaces of these pads prevents build-up of sharp items, such as splinters, that can scratch floors. It is also resistant to tearing and penetration, providing extra durability. Comfort Knees are designed for floor installation. They provide protection for both kneeling and 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.