I read all the reviews before I purchased my slippers about how they run small. I normally wear a 7-7 1/2 shoe, so I went with the size 8, thinking that I would be ordering up enough for it to fit. Boy was I wrong. It was way too small in the big toe, and dug into my heel. I do like that the straps are custom fit to your feet (downside is that you have to do it yourself). I will be re-ordering in a size 9 as soon as I have some extra spending money. I gave the smaller size to a friend with smaller feet (size 6 1/2), and they fit her perfectly. If you order, order at least a full size up, if not a size and a half.