"I usually have a tough time finding flat shoes that fit well. I'll wear either a 9 or 10, my foot is wider in the toe and narrow in the heel, and I need arch support because my feet pronate. I went with a size 9 because it fit my heel, and I was able to loosen the toe by loosening the laces. I've worn them out a few times now and found them to be pretty comfortable and they didn't rub my fee the wrong way. This is the first pair of Sperry's I've owned, and I'll definitely try Sperry's again. I'm glad I got these!"