I got this for my 11 year old daughter when we go skiing. She could do with a medium as the large is baggy on her. However the length of the medium would be too short. The waist can be adjusted but will still be roomy. She can easily wear sweatpants underneath. These ski pants are quite well made and the fabric seems durable. I cannot comment if the pants are warm or water resistant as we have not yet used them in the snow.
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