I have a problematic foot.  Somehow my size in shoes differ from my size in sandals and slippers.  I was not sure what size in this would fit me so I bought my regular shoe size.  I generally wear a size 6M in open sandals and a size 5.5M in shoes so I bought a size 5.5M.  They fit but are a little narrow in the middle but that was my fault, I guess I would not have bought 5.5W as some reviewers said it was a little wide at the front.  I suppose I would not have known that, but apart from that the length is fine.  I still give it five stars because it is still a beautiful pair of sandal and it looks great.  See the pictures I have posted.