This shoe seems to run a size large. Before I ordered, I did some looking around and found that Ecco's shoes were often praised for comfort and durability, but criticized for
running larger than marked. I ordered a 40, and I'm a US size 7 to 7.5. The shoes are the most comfortable I've ever owned. I haven't had them long enough to comment on their durability. I like them so much that I plan to buy another style from the same brand in a couple of weeks.