Measure up your thigh while blending your knee slightly. Start at the center line of your knee. This is the time to measure the upper circumference. Measure down your calf beginning at the middle line of your knee. At this point measure the lower circumference. Ensure that the measuring tape is applied to the leg without puncturing the skin Unique anti slip design two packs knee brace style no matter how active your are the double lined anti slip silicone keeps the patellar tendon securely in place. It doesn't roll slide or slip down Benefits of knee brace professional highly suggest our knee brace The support is pleasant and elastic thanks to out soft knit fabric. Because it is breathable perspiration cannot seep through it like it can with neoprene and other subpar materials. Because they can be machine wash on a mild cycle our brace retains their flexibility and original fit Additionally it is wonderful present for an arthritis sufferer