Not very thick for winter, but about 3 times thicker than regular thin cotton leggings. They look and fit like regular leggings. They are soft on the outside but not soft on the inside. I'm not sure what you mean by "fleece". My daughter wears a size 7 and the medium one is a bit long for her but fits everywhere. Even though they are not that soft, my daughter still likes them a lot and she is very picky.
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