I used to fit in their size 11 M US perfectly, but they must have trimmed down the surface area of their shoes to save some money. I am really disappointed with these sandals. I used to love this brand. When I received the sandals, I took them out of the package and wore them all day thinking they looked a little small but I could make it work. I would have returned them but they didn't look new after I wore them for eight hours at school. In the past, I have bought a lot of sandals from Reef. I am disappointed with their recently changes though. These sandals were a waste of money.