And DH found that he can't wear regular crocs at all. He read and was told at the Crocs outlet that if your big toe is shorter than the toe next to it then they wouldn't fit. Guess what this strange little tidbit was right. Everytime he tried to walk in them his toes were squished. For everyone else in my family they ran one size smaller, even for me and I wear a EE shoe. I'd say you definitely have to try them on. The good news is practically every major sportswear and non-discount department store carries them so they're easy to try on.