I have no idea what size they use for this, but they can't be standard shoe sizes. My child wears 4 but I have 7-8 because the slippers can be mixed up until they get better and that's how we last more than a year. Bad luck. We tried to get his leg in and finally succeeded, but they were so tight he would never put them on. The inner/outer sole feels durable enough for a few outdoor walks. The lining, while not as soft as I like, was still warm if you were wearing socks or barefoot. The faux suede looks pretty decent and would probably be worn for 2 years. Unfortunately, that's all moot since he can't even wear them.
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