I ordered a 5.5 like some of the other reviewers suggested and they fit fine lengthwise. I usually wear a 6 in most shoes. I'm finding that either my feet are getting wider as I age or shoes are being made narrower these days. These are pretty narrow but I've been able to stretch them out by wearing them and they fit okay...not as comfortable as I would like (no support inside). I'm keeping them because I like the style and I'm too lazy to send them back.