I was surprised at how soft the upper rubber was. The lower part is the material that crocodiles are made of and is very soft. They are the same size and size as his croc shoes, but I would say they run large because he doesn't wear socks with them, so they often fall off when he gets out of the pool. However, they helped him to stop slipping on the plastic pool! So if you want them to be snug, go down a size. My son is a size 5 and I am a size 5/6. As long as they work, he will grow up in them. All the water will splash out of the water after a few steps. Brilliant!
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