Self-Heating Knee Pads FOUR-SIDED ELASTICITYThe comfortable fabric has four-side elasticity, which fits the curve of the knee, stretches freely, and is suitable for a variety of types legs. DOT MATRIX HEATED CLOTHthermal printing and dyeing technology, continuous heating physical therapy, mesh relieves discomfort, self-heating to keep warm, continuous heat. ERGONOMIC DESIGNFit joints without tightness, humanized design, take care of joints. Human body curve design, bend freely, easy to wear.