I have been using cotton t shirt, cotton poly pants, a wool jacket or asbel pullover, and poly pro base when needed for 25 years for elk. Never had a problem, never cold or even uncomfortable. My cousin/hunting partner has been using merino wool base under cotton t shirt and cotton poly pants of late and he is very happy. He just puts on thicker base when colder. If very cold he does KOM over the whole thing. I plan to go the merino wool base route also (wife bought me some for christmas), and love the asbel pullover in extra heavy weight as outer garment. It fits easily into my butt pack on my catquiver 6.5 (same use as army LCE with buttpack). For when it snows and blizzards I have grey wolf woolens with liner, I swear I could sleep out overnight in a snowbank wearing that stuff, comfy at minus 20. All I know is wool is warm when wet and synthetics are not. I have crossed a frozen stream up to my neck in frigid running water, snow on the ground, and as soon as all the cold water quite running out of the cloths I was warm again, like under 1 minute.
You can wear wool every day forever and it never starts to take on BO. Synthetics get funky in a day or three.
I looked at the high dollar techno stuff, but at comparable warmth it also has comparable weight. My wool feels like pajamas, as does the stretchy mountain SG stuff. Wool is comfy in a wide variety of temps and breaths, the SG stuff feels like I am wearing a rubber suit. Wool is dead quest and the pile blends in even without commercial camo pattern. The SG appears "shiny" on the surface.
Lastly, I hunt with osage selfbows and occassionally one of my homemade glass lam bows, and the synthetics just look weird when carrying a self bow and wood arrows. Like fly fishing with a bamboo rod off a bass boat with 200 hp motor and depth finders. When I see a comfort and utility advantage I will get some. Just have not seen it yet.