Walking in w/ UA is fine. Sitting in a stand for a few hours in the UA doesn't get the job done. Unless, I'm in my Heavy Cabelas Suits. I spent the crazy money, and the new technology hasn't worked out for me. At 6'2" and 270lbs. it's not like I'm a little guy that gets cold easily.
I'm going back to old school fleece. I can't afford to waste a good hunting day being cold.