I am a size 7 and would like to go down a size as my daughter who bought a size 6 fits me best. But with that said - a size 7 fits and stays - just not as tight as I would like to be on the waves. .I liked that the water drained easily from the inside of the shoe. I ended up buying 6 pairs of different sizes for a family trip to Hawaii. I bought the sizes according to our actual size. All 5 of us thought a size down would be better. But it still worked fine. This is a great product!