Adams USA model KK-17 volleyball/basketball pads are a pair of knee guards. They feature a nylon reinforced cotton shell and a 3/8 inch vinyl foam contoured pad. The 6.5 inch long pads are washable and are available in three sizes: SMALL - 12 to 15 inch cuff size, MEDIUM - 15 to 18 inch cuff size and LARGE - 18 to 21 inch cuff size.