Important facts about our socks:
Unisex Sizing: Medium fits Men's US shoe size 3-9 and Women's US shoe size 4-10, Large fits Men's US shoe size 6-12 and Women's US shoe size 7-13

Fiber content: 60% cotton,  35% Nylon, 5% Spandex 

Made in USA: Designed by two lovely ladies in Minneapolis. Knit in North Carolina.