We haven't tested these at the water park yet (which is why I bought them) but both my daughters have worn them around the house to run and play and report that they are comfortable . They are also great for outdoor water play, they can even be worn in the park and regular summer play which is what I love the most. Don't waste money on shoes for just one purpose! My only complaint is that the sizing is a bit odd, my youngest daughter needed a larger size than her usual shoe size and my eldest daughter needed a smaller one. In addition, the ankle hole is very large, which makes it impossible to increase them (otherwise they will slip on the heel). I had to buy 3 sizes of each to find the right size but can't beat the free returns. I'm keeping the size for my oldest daughter to grow up and will buy a larger size for my other daughter if she performs well at the water park this weekend.
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