It matches the shape of the knee with 3 pads for excellent mobility. Sell one today! <3-part construction> The pad is made into 3 parts for movement. Safe as well! Stop-rubber and tricot: Uses rubber and tricot material to reduce pad slippage. 3 pads for ease of movement. Also available in small sizes. Size: J (XS) (Upper knee 9.8 - 13.8 inches (25 - 35 cm), Length 6.3 inches (16 cm)), S (Upper knee 11.8 - 15.9 inches (28 - 38 cm), Length 7.9 inches (17 cm), Size XL: Upper knee 13.8 - 19.7 inches (2.7.7 inches (2 inches (3 inches (2 inches (3 inches (20 cm).