These socks were inexpensive, but they either run small or are cheaply made. When stretched slightly, they shine through and shrink when washed. My son wears toddlers 11-12. I ordered medium and you can see his feet through the socks. He still says they are comfortable but I have a feeling they should be thicker. Rubber on the heel prevents them from slipping and falling with the shoes, but if your child is sensitive to such things, be aware. Wouldn't order again.
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