We have Under Armor Cold Gear compression shirts. I chose this one as it was half the price. I was expecting a lower quality, but it isn't. Nice, dense compression material with a soft inner part. The perfect base layer for skiing or sports on cold days. Bought XS for my 7 year old girl and M for my 10 year old boy (same size as her UA shirts). Both are slightly above average height, but slim.
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