Anything from mid-low 30’s i just break out the fanatic bibs and jacket. Sitting in a tree with high humidity is a whole lot different then hunting out west as far as staying warm is concerned. I have layers that can get me into the 20’s in a tree but it’s just easier/simpler to throw on my fanatic with a light base layer and not even worry about being cold. If it does get a little warmer, I’ll unzip them some and I’ll be good. You will die if you try to walk in it though.