Medical compression socks are socks specifically designed to apply pressure to the lower legs, which can help improve blood circulation in the legs, reduce discomfort and swelling, and prevent or treat some diseases of the vein and lymphatic system, such as varicose veins, deep vein thrombosis, venous ulcers, lymphedema, etc. Medical compression socks have different pressure levels, from mild to severe, generally expressed in millimeters of mercury (mmHg). Different stress levels are suitable for different conditions and groups of people, and generally require a doctor's prescription and guidance to use .The principle of medical compression socks is to improve venous function by grading pressure, that is, applying maximum pressure at the ankle joint and then gradually decreasing it along the lower leg, which can promote blood return to the heart and prevent blood from pooling in the veins .