We love this product and buy a new pair every year, but you do have to understand this is not a replacement for the regular keens.  It is a plastic shoe and the construction is not the same. Its not suitable for a long day of walking or running. But we love it for trips to the beach/pool etc.  these are much sturdier than crocs or flip flops, which have caused my kids to fall when running. No issues with that here. We've never had blisters and they have held up well to be handed down from one kid to the next.