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Bought for my 12 yr old son for soccer on these cold days. Bought him a small, he is about 90 lbs and 5'1" and these are just a bit too long and slightly baggy. He will grow into them soon enough. He LOVES these. I have to buy more because he wears them everyday. They keep him warm even though they are so thin. I'm sure if he had the right size it would help his leg pain. Going to be purchasing many more.