To be honest I'm not really sure what my shoe size is. Because of my feet being kinda wide, I usually pick a 7.5 or 8 but could survive in a 7. I went with the 37, or the US 7/7.5, and they're just baaaarely too big, enough for the toe ridges to not match up and there to be a small gap in the heel (also, they make this silly sucking sound on my feet when I walk). I ordered a 36, hoping I'm not an in-betweener in sizes because I really do love these; will update my review upon receiving those.