Size chart for Men

Active
Secret
Fleece
Merino Wool
Ankle Boot Socks
ComFits

Active Socks | Men

US Men US Youth Euro SOCK SIZE
3.5-5 Y3.5–Y5 35.5-37.5 S
5.5-7 38-40 M
7.5-9 40.5-42 L
9.5-11 42.5-44 XL
11.5-13 44.5-46 2XL
13.5-15 46.5-48 3XL
15.5-17 48.5-50 4XL

Secret Socks | Men

US Men US Youth Euro SOCK SIZE
3.5-5.5 Y3.5–Y5.5 35.5-38 S
6-8 38.5-41 M
8.5-10.5 41.5-43.5 L
11-12.5 44-45.5 XL
13-14 46-47 2XL
14.5-15.5 47.5-48.5 3XL

FLEECE SOCKS

US Men Euro SOCK SIZE
4-5.5 36-38 S
6-8 38.5-41 M
8.5-10.5 41.5-44.5 L
11-12.5 45-47 XL

(If you are between sizes, size down.)

MERINO WOOL SOCKS

US Men Euro SOCK SIZE
4-5.5 36-38 S
6-8 38.5-41 M
8.5-10.5 41.5-44.5 L
11-12.5 45-47 XL

ANKLE BOOT SOCKS

US Men Euro SOCK SIZE
4-5.5 36-38 S
6-8 38.5-41 M
8.5-10.5 41.5-44.5 L
11-12.5 45-47 XL

ComFits

US Men Euro SOCK SIZE
3-5.5 35-38 S
6-8.5 38.5-42 M
9-12 42.5-46.5 L
12.5-15 47-50 XL