We have not tested them at the water park yet (which was the reason for purchase), but both of my daughters have worn them around the house, running and playing, and report they are comfortable. These will also be great for water play outdoors, could even wear at the park and for general summer play, which is what I love most. Not wasting money on a shoe for just one purpose! My only complaint is the sizing is a bit strange- my younger daughter needed a bigger size than her typical shoe size, buSee full review