Spring knee support technology. An anatomically contoured gel pad surrounds the kneecap, double-sided metal spring stabilizers fit tightly with your knee joint. These special functional element strengthen side support and maintains joint stability. It effectively disperses pressure, keeping your knee warm, lubricating your joints. Three-dimensional structure of woven, High-precision 3D cutting technology of knitting. Ergonomic 360°perfectly fit your kneecap curve.