Last archery season in KS my wife and I were wearing Under Armour HeatGear since it hit over 90degrees on a couple days....

I bounce back and forth between cheap hanes or fruit of the loom knit thermal underwear or Under Armour ColdGear on top and bottom. Coldgear is great, but it HAS to have some windproof layer above it, otherwise it will end up making you colder. Plus UA is $100 or so for top and bottom, whereas I can get the Hanes for $10.

100% best investment a Kansas Hunter can make is a windproof layer. Think of the sleek black North Face jackets you see around. Last season, even on our coldest days in Kansas, I never needed more than: Hanes thermal top, Northface vest, Northface jacket, Under Armour Hoodie. Only change the year before, when it hung out at 10-20below, with 40below windchill, and 40mph standing winds during rifle season, I wore the same base layers of Hanes, North Face vest, North Face, and a Carhart hooded jacket instead of the UA Hoodie. I hunted southern MN last year as well wearing the same kit.

Last archery season, other than the 90degree days of course, I mostly wore just hanes thermals and the northface jacket, good down to about 35degrees.