We use the English system (from 6 to 12 in. With half points). If you have doubts about the size, consult the following equivalence table:
To ensure that the chosen size is correct, the ideal is to measure both feet (there is always one longer than the other). Stand on a sheet and support them together with your heels close to the wall. Always measure the longest foot from the heel to the big toe and with that measure look for your size in the following table of equivalences:
