I have never tried Under Armor.
I don't have a whole lot of experience with heat but cold, yes. Under Armor is great if your constantly moving, if you stop you get cold. (from what I hear) I know plenty of hunters that tried Under Armor then went back to plain 'ol wool for that reason, especially at 8000 ft in November hunting Elk. I love wool for cold weather, even if it gets wet, it is still warm. But if cotton gets wet, it gets cold, hence why I wear thin cotton in the summer. Made sense to me..lol
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