These Dr. Motion compression socks give you the graduated support to help relieve tired, aching legs and feet. They feature a mild compression level of 8-15 mmHg which makes them extremely comfortable to wear all day, every day. They are perfect for travelers, athletes, people who sit or are on their feet all day. Graduated compression helps to maximize circulation while minimizing swelling (which reduces the risk of blood clots and varicose veins). These styles fit sock size 9-11 (shoe size 4-10) and are made of a microfiber nylon blend that is anti-microbial and anti-order.