Men's / Unisex Size Chart

Sock Size Men US Women US* Euro UK
XS 2.5-5 4.5-7 35-38 2.5-4.5
S 5.5-7.5 7.5-9.5 38-40 5-7
M 8-9.5 10-11.5 41-42 7.5-9
L 10-12 12-14 43-45 9.5-11.5
XL 12.5-14.5 46-47 12-14
XXL 15-17 48-50 15-16

Women's Size Chart

Sock Size Women US Men US* Euro UK
S 4.5-7 2.5-5 35-38 2.5-4.5
M 7.5-9.5 5.5-7.5 38-40 5-7
L 10-11.5 8-9.5 41-42 7.5-9

*The men's-sized sock styles tend to reach a bit higher on the leg compared to the women's sock heights. Just FYI.

Sock Height

Sock heights are relatively universal. The below visuals can give you the general idea.

Graphic showing sock heights compared to each other for sock sizing chart help
GIF showing darn tough sock lengths on leg with shoes