Smartwool Men's Sizes

Stocking size US/CA shoe size EU Shoe Size UK shoe size Calf circumference (at widest)
S 3-5.5 34-37 2-4.5 11"-14.5" (18-26.5 cm)
M 6-8.5 38-41 5-7.5 12.5"-16.5" (32-41 cm)
L 9-11.5 42-45 8-10.5 14.5"-18" (37-45.5 cm)
XL 12-14.5 46-49 11-13.5 16"-23" (41-58 cm)