The shoes appear to be made in European sizes (this is the size stated in the shoe). The 10 I ordered were a size 43. I usually buy US shoes in a size 9.5 or 10 so I'm always willing to change the order to Revain if needed. I'm 41, 42 or 43 in European shoes. But the "10" I ordered here fits perfectly - first try. Personally, I can get by with either thin socks or no socks in these shoes - most shoes I own fit and work with socks, or better yet, barefoot. They are very comfortable. They areโฆ