Tend to be a 9.5. But that wasn't a size I could get so I sized down to a 9 because I figured no socks were involved and hoped it would be fine because I was ordering at the last minute before our trip the the DR. They fit great and worked well. They honestly look super nice - The navy was pretty - and they are very light weight. The upper is ultra flexible so they were easy to pack too. Didnt *really* need them in the Dominican but theyll be great for our regular east coast beach trips for sure.