I do a lot of what Martin Cougar stated, but I typically do either stand hunting or still. When I'm in my stand and it's very cold out, I will use my Mr. Heater to keep me warm. When I'm still hunting or doing some walking, I multilayer as much as I can to keep me as warm as possible. I also use those chemical heaters in my boots. When it gets to a point where I can't take it anymore, it's time to go. Use good sense.

T