Too small for my kids foot

My son wears a size 3.5 shoe. Bought these thinking they would be great. They state one size fits all and should work for up to 12 year olds. They were too small. The only way we could get his foot in the shoe with the hickies installed were if we left them unhooked. He does not have wide feet or anything. I guess I should have purchased the adult sized ones.

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