Alleviates sub-chronic and chronic pains. Soothes knee discomfort and supports injury recovery. Enhances blood circulation. Utilizes 3D knitting for improved stretchability and a better knee joint fit. Suitable for long-term wear without hindering daily activities. control / smartphone app: five heat-setting levels & maintain constant temperature 15/30/60-minute timer *smartphone app can connect up to 6 KnitWarm products at the same time