Just ordered these for a tubing trip I'll be taking soon.  As soon as I took them out of the box I loved the way they looked! Put them on and they were so comfortable.  I have not worn them in the water yet, but I can't really imagine them slipping too much with the way the tread is so thick on the bottom.  The strap fit perfect and I wore them all night walking around the house and the store and they didn't loosen.  I normally wear an 8, ordered a 7.5 after reading other reviews.  Can't wait to take them to the beach and everywhere else!