1The flexible coil spring can be bent freely after wearing, which can fit the concave and convex of the legs for wearing comfort. 2The elastic fabric has uniform pressure, is not easy to deform, soft and comfortable, thin and breathable. 3Fine sewing process and edge design, smoothly appearance, fit the skin. 4Helps to easily absorb sweat, cotton fabrics provide the necessary insulation function while keeping knees warm. 5Helps with circulation, light, comfortable and stressfree, so you can wear it all night.