1.Material:70% nylon?,20% rubber,10% elastic fiber; * 2.Four avaiable size:S(8.9~10.4 inch),M(10.4~12.4 inch),L(12.4~14.6 inch);XL(14.6~16.8 inch); * 3.Measure around the elbow joint; * 4.Provides support and compression to weak or injured elbow; * 5.Slender, hardly bulky design.