I wear 11.5 (US) 4E wide which is hard to find. So I decided to try the US size 12 and it barely fits, I was expecting extra toe room and there is none, and it's a bit tighter than I'd like when the laces are totally loose, but I can handle that . Doesn't fit me right. I sometimes have severe pain in my right leg due to arthritis, but I bought these for deadlifts and only wear them for a short time. They are great for that, very flat thin sole, just what I wanted so I'm happy. They don't really bother me, only wear for 1 or 2 hours at a time and are likely to break.