My lease in inNW Oklahoma. Although not Michigan, it gets pretty cold and is always very windy. I bring a green army sleeping bag with me, tied to my pack. When I get into the blind, I find that getting into my bag up to my waist or a little higher, it keeps me warm through the long day. And my hands are free to glass and fire the rifle. Strange thing is I am always hot. I would keep the AC turned down to 65 if I could afford it. But when I get still, i get pretty cold.