It uses high density polyurethane which is strong enough and thick enough to both protect your knee and cushion it at the same time. Its ribbed design gives good stability. It also prevents water absorption making it ideal for working in wet environments. Features and BenefitsUses high density polyurethaneProtects and cushions your kneeRibbed designed for stabilityPrevents water absorption in wet environmentsRetail bag which aids presentation for retail sales15.5cm x 14.5cm x 2cmThis product is sold in pairs Specifications Colour: Black Fit: R