TCK Maryland Flag Crew Socks High Quality: 77% Polypropylene, 17% Nylon, 3% Elastic, 3% Lycra Spandex Made in USA Shoe Size: Small fits Youth 12-5; Medium fits Mens 6-9 or Womens 7-10; Large fits Mens 9-12 or Womens 10-13; X-Large fits Mens 12-15 or Womens 13+ Moisture Control, Odor Control, Antimicrobial, Breathable Mesh Arch Compression, Heel & Toe Construction, Double welt top Blister Control, Ergonomic Cushioning