I have a pair of these and I can confirm they are good and warm and even I have trouble with them slipping . out, they are amazing in rain boot outside. They insulate very well but take up all the remaining space in your boot. So if yours are already a bit tight on you, you may not have enough room to wear them in your boots. Every fall I adjust my baby rain boots to make room for these socks, by spring they've grown enough and the weather has warmed enough, we don't need room for fluffy socks anymore, so it's no problem, I expect take a long time.
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