This is designed to fit into shoes and helps to align the little toe, also called as Tailors Bunion towards its natural healthy position

In centimeters
Sizes Length of Foot Heel to Toe Circumference of arch
S 18.9 to 19.8 19.5 to 20.4
M 19.9 to 21.6 20.5 to 21.4
L 21.7 to 24.8 21.5 to 23.4
XL 24.9 to 26.0 23.5 to 25.4