It could occur around 1cm difference depends on measurement method.
The size selection criteria vary depending on the shape of the individual foot.
You can compare it to the shoes you usually wear by referring to the detailed size of the products.
MaterialFABRIC
ColorBLACK, BEIGE, IVORY, KHAKI
Size36, 36.5, 37, 37.5, 38, 38.5, 39, 39.5