Anybody using these Puffy Pants for 2nd Rifle in Colorado or similar? I was thinking of ditching a bottom base layer, but still keeping merino boxers with Kuiu attacks. I figured if I got cold while glassing/napping they would do good, and I could wear them in a 20* bag and not bring a 0*. Figure it would save weight, and is more versatile. Is it over kill for Southwest CO during the 2nd rifle?