I'm so glad I read the reviews before buying these shoes. I usually wear 8M but can also fit in a 7 1/2 if the shoe is wide as I have short, fat feet that swell at the end of the day. I purchased these sandals in 8 1/2 and they fit perfectly. The straps were loose enough and very comfortable so I could wear them the whole day with no problems...really not recommended for narrow feet.