1.Material:47% polyester fiber,36% rubber,14% nylon and 3% elastic fiber; * 2.Two avaiable size:S/M(23.8~33.7 inch), L/XL(33.7~43.6 inch); * 3.Measure around the waist; * 4.Super light high concentrated support belt; * 5.Slow because of frequent action or long-term fixed position and produce fatigue situation.