Find your sock size using this chart: First, determine if the model of sock you wish to purchase is sold in Unisex/Men's sizing or Women's sizing. Then, find your shoe size in the corresponding chart below. If you are on the border of two sizes, go up if your feet are wider, and go down if your feet are narrower.
Unisex Sock Sizing
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  M L XL
Men's (shoe size) 5½-8½ 9-12½ 13-15
Women's (shoe size) 6½-10 10½-13 -