When I first tried on this shoe it felt a little wide, and.  as I have a narrow heel, the shoe had a potential to rub.  Last night I taught a deep and shallow water aerobics class and the shoe was very comfortable.  Many times I am up on the deck describing how to move in the water, I dance around, hop up and down and I need good support for this.  The Teva came through.  I don't think I could wear this shoe while I walk along the beach in and out of the water - definitely would rub.  But for H2O, perfect.