It was 28 degrees on Monday and for the first time I wore an UA baselayer. I have worn Hot Chilis not bad and Polar tech again not bad but the UA out performs anything I have ever used even Merino wool whci I find too hot. Over the UA I wore a short sleeve cotton T shirt (not good practice) but I do it a lot and then my J+G waterproof breathable jacket. I wore my Novara Headwinds pants over padded liners on the bottom. When changed out of my clothes after I got to work my skin was not wet from sweating and the cotton T-shirt was slightly and I mean slightly damp in a couple of places. I always felt that the UA stuff was pretty hyped up and overpriced but when I found this one item on sale I bought it to try out. Needless to say I ordered two more of the same pieces. My other baselayers are going to the Goodwill. The UA rocks.