Merrell Women's Socks Sizing:

Small: Women's 4.5-6

Medium: Women's 6.5-8

Large: Women's 8.5-10

Merrell Men's Socks Sizing:

Medium: Men's 7-9.5

Large: Men's 10-12.5

XL: Men's 13-15.5

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