We bought them when we got to Flagstaff and it was still snowing here in March. They definitely did their job. The only criticism is that they often slide down to the ankles and can be easily removed when worn barefoot.
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Pros
Seems to be of good quality considering the relatively low price. They fit my 6 year old and my 9 year old.
Cons
Terribly done. A lot of pilling and threads come out.