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Simcan Socks Sizing:

Small: Women's 5-8, Men's 4-7

Medium: Women's 9-12, Men's 8-11

Large: Women's 13-14, Men's 12-15

EC3D Socks Sizing:

2: Women's 6-8, Men's 6-7

3: Women's 8-10, Men's 7-9

4: Women's 10-12, Men's 9.5-11.5

5: Men's 12+

Smartwool Socks Sizing:

Small: Women's 4-6.5, Men's 3-5.5

Medium: Women's 7-9.5, Men's 6-8.5

Large: Women's 10-12.5, Men's 9-11.5

X-Large: Men's 12-14.5

XX-Large: Men's 15-17.5

Sockwell Socks Sizing:

Women' S-M: US 4-7.5, EU 35-38

Women's M-L: US 8-11, EU 39-43

Men's M-L: US 7-10, EU 39-43

Men's L-XL: US 10.5-13, EU 44-47

Men's XXL: US 14-16, EU 47.5-50