These mild (8-15 mmHg) graduated compression over the calf (OTC) socks are great for workout recovery or help get you through the workday by improving circulation and reducing fatigue and swelling. We recommend a larger size if your foot is between sizes to reduce the chance of premature wear. Mild graduated compression. (8-15mmHg) Improves the circulation of oxygenated blood. Natural moisture-wicking materials to keep feet dry and blister-free. Smooth integrated toe seam stitching for comfort. Sock Materials: 70% Bamboo Viscose / Polyester / Rubber-Nylon-Spandex