1.Made of 75% Rubber foam and 25% Nylon? * 2.Light, convenient, comfortable? * 3.Sleeve around design can reduce wrist load? * 4.To prevent excessive use of the wrist and cause damage? * 5.Four avaiable size:S(5.5~6.3 inch),M(6.3~7.3 inch),L(7.3~8.3 inch);XL(8.3~9.3 inch).