Use your calf measurement around the widest point as your primary reference point and your shoe size as secondary when reading the size chart.

Standard
XS: Calf Circumference: 10-13" | Shoe Size Womens 4-8, Mens 5-7
S/M: Calf Circumference 14-16" | Shoe Size Womens 8-10, Mens 7-10
L/XL: Calf Circumference 17-19" | Shoe Size Womens 10-14, Mens 10-13

Wide-Calf
2XL: Calf Circumference 20-22 | Fit's all shoe sizes

3XL: Calf Circumference 23-24 | Fit's all shoe sizes
4XL: Calf Circumference 25-26 | Fit's all shoe sizes