I ordered 9.5 and they sent 43 (EU). I had to send it back to get 42 (EU) and they are perfect! Since the nurse walks all day, my legs feel good. If I have to wear a lead apron, these shoes work even better because they're heavier than my Birkenstocks and I don't feel like I'm blowing them up. This is my 4th pair in my 14 year career so they will last 3-4 years before needing replacement. My last pair still looks great, only the insole is uncomfortable...great shoes!