WOOL 58%, NYLON 40%, ELASTANE 2% Imported Moisture-wicking merino wool makes these the best winter running socks. Wide arch compression keeps socks in place, preventing injuries and sprains. Thin and lightweight socks are great with athleisure outfits for men and women. The hand-linked seamless toe box of these wool athletic socks prevents chafing. The reinforced heel and toe of these socks make them extremely durable.Y-heel stitch keeps no show socks in place, with no slipping or bunching.