Material: nylon+spandex+rubber latex thread Size :S,M,L,XL Weight: 120g approx Type:Self-heating knee pads Functions: protect the knee, prevent arthritis and relieve joint pain Package: knee sleeve *1 pair Size Body Weight(kg) Width(Tiled)Length(Tiled) M 40-55 14cm 26cm L 55-70 15cm 27cm XL 70-90 16cm 28cm 1. Knee Protector: The pads can protect your knees, prevent arthritis and relieve joint pain. 2. Fatigue Removal: The pads feature the magnetic therapy to improve blood circulation and helps to relax muscles and reduce fatigue. 3. Breathable Design: The pads feature the high-elastic fabric, which are skin-friendly, breathable, stretchable, soft and comfortable to wear. 4. Premium Material: The pads feature the tourmaline heat-sensitive material to contact with human skin, and the body movement releases energy and makes the knee feel hot. 5. Three Sizes: There are 3 sizes of the pads for optional to ensure a comfortable fit to your knee, which are suitable for the entire family, suitable for different body needs, and the pads feature the high stretch fabric, which is closely tight to the body.