Backcountry Hunter 2
Active member
The cold weather UA baselayers are thick. In September in CO you will sweat profusely in steep terrain in any garment. The thicker the garment, the more you will sweat. In September my choice is a short sleeve merino t shirt with a sitka lightweight hoodie over the top. I take the merino shirt off during mid day, weather depending of course. IMO the thick UA stuff is much better as a midlayer. It provides that much warmth! Investing in the black ovis, or something like the Costco merino layers will make you much more comfortable for very little money. Good luck!