I bought two of these for my nephews and they've used them, outside, like wild men. These come with a pump, big bonus, and blow up fast. I'd suggest this size for a 5/6 year old. The 4 year old isn't small for his size but had trouble reaching the ground. A smaller one would be the better buy for that age range. So.pump, durable, cute, loads of fun, and a great price.
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