TCK Canada Flag Baseline Crew Socks 93% 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+ Moisture Control with TCK proDRI, Blister and Odor Control Fabrics Antimicrobials built-in, Arch Compression Zone, Breathable Mesh Fiber Contents: 93% Nylon, 05% Elastic, 02% Lycra? Spandex Made in the USA