@luism Sounds correct albeit frustrating. I imagine it would be trivial to add a column or two to the sizing chart printed on the footwear since it already lists the sizes for various regions, but I would think an X by Y mm measurement standard could cover most cases. All genders have varying arches, widths, calf circumferences, etc, and there are already so many sizing disparities between manufacturers. Maybe this allows for greater QA tolerances to reduce returned merchandise?