I bought these thermal underwear for my 9 and 11 year olds. They have a different body shape, but both thermals fit exactly, not back to back, but as thermals should. I was hoping there would be a "little" margin for comfort. My boy was fine and that's the main thing. The sleeve length was perfect for my 11 year old and the cuff needs to be folded down for my 9 year old with a total pack of 2 in a size 10-12.
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