S M M Wide L L Wide XL Women's Shoe 5-7.5 8-10.5 8-10.5 11+ 11+ - Men's Shoe 6-8 8.5-10 8.5-10 10.5-12.5 10.5-12.5 13+ Calf Circumference 10-14" 12-14" 14-16" 15-17" 17-19" 18-20"