I got this for my 10 year old son to wear as a base layer. He is about 4' 10 and 139 lbs, and is wearing a medium. It fit nicely and has some room for him to grow. The shirt has a nice rebounding stretch, (which I was able to see when he pulled the neckline down to his mid chest while telling me he was like a wrestler๐คฆโโ๏ธ). He says it is warm. He's happy, so I'm happy.
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