1.Made of 75% Synthetic rubber and 25% Stretch nylon; * 2.Light, convenient, comfortable? * 3.In accordance with the elbow curve design a tubular pad; * 4.The elbow to provide basic support and fixed ability; * 5.Six avaiable size:XS(7.9~8.9);S(8.9~9.9 inch),M(9.9~10.9 inch),L (10.9~11.9 inch);XL(11.9~12.9 inch);XXL(12.9~13.9 inch).