Tested - Our compression socks feature a tested, Class I mild compression level of 8-15 mmHg. This lower level compression is great for assisting blood flow and support for everyday wear all day. Dr. Motion socks are all knitted with three zones of compression from the ankle to the calf to ensure proper pressure in each part of the leg. This reduces the risk of blood clots and varicose veins. Graduated support relieves tired, aching legs and feet and reduces muscle fatigue.