TCK Shamrock Lucky Clover Crew Socks 20% nylon Shoe Size: Small - Youth 12-5 Womens 4-7, Medium - Womens 7-10 Mens 6-9, Large - Womens 10-13 Mens 9-12, X-Large Womens 13+ Mens 12+ Crew Length, Made in the USA Arch Compression and Heel/Toe Construction, Moisture/Odor Control Antimicrobial Blister Control, Breathable Mesh, Ergonomic Cushioning Fiber Contents: 70% Polypropylene, 20% Nylon, 08% Elastic, 02% Lycra Spandex