The sizing for these are so weird. I went for the men's shoe because I told it was wider than the women's and otherwise identical.  I normally wear a ladies 10 or a mens 8.5.  If I go by those numbers and change to European sizes the resulting show is huge. But when I size down the jump is too big and they are too small. By small, I mean narrow. I don't normally even where wide width shoes. But I do require a good sized toe box. In my experience, all Ecco shoes run slightly narrow. Too bad because these are cute.