I refuse to use a heater. I wear my Sorrel Dominator Pac Boots, good to -100 below and I have a hand warmer with a heat pack in it for the hands. With enough layering (wool is heaven) I just sit there and shiver until I turn blue in the face... Actually it is my hands and feet that get cold first.

Now granted there have been late afternoons where I sat there and had the shivers, but I refuse to leave. Probably why I've had hypothermia a could times in my life.. Have you ever seen a person in uncontrollable shivers? I have had them and believe me, it is a terrible condition to be in. You shake so hard you can not even walk or talk. When I start to reach that point, I head home.

Now I have friends that use them Mr. Heater Buddies and their in them blinds of theirs without winter coats on. But I was always worried about the sounds and smells from one of them heaters.