These are good swim shoes - we will be using them for summer mostly for backyard water activities (kids pool, water table, sprinkler) not quite for swimming. I wasn't sure about the size - my son is a size 6 so I wasn't sure if I should go for a 5/5.5 or 6/7. I went with 6/7 and they work great, they don't fall off their feet and there is still room to grow. The actual boot is made of fabric (like socks that can walk on water) but there is a rubber outsole on the bottom to improve traction. The sole is flexible. When I first got them I put them on my son just to check the size and he was so happy with his new shoes that he didn't want to take them off so I think they are quite comfortable. It's easy to put on and still holds up which is great.
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