I usually wear a 6 or 6.5 and based on previous experience and what other reviewers wrote I decided to try a 7. They are very comfortable and my only comment would be that maybe they are a little long by the toe area, but nothing terrible. I have been wearing these on long walks in the heat with the dog and I am happy with the comfort and support. I would buy them again (assuming they do not change the way they are made). I did not get these for water use so I have no complaint like others wrote. I give it 4 stars instead of 5 because I do think this brand is over priced.