Sof Sole Running Select sox feature COOLMAX which is a Polyester material that moves sweat way from your feet. These sox also have seamless toes which makes them very durable and removes a common source of irritation. The deep heel makes the sock very stable and stops it from moving up or down the foot. The top of the foot is ventilated which will keep your feet cool. The top of the sox are made from a comfortable non-binding material.