I did some research before purchasing this sleeping bag and I read where the mummy-design sleeping bags tend to be warmer than the rectangular designs, other factors being equal. I had a mummy-type bag in my earlier years of camping and it was, indeed, very warm. I'm an older guy now and have a touch of arthritis in one of my knees, requiring me to change my sleeping position sometimes during the night. The Heritage Hunter Extreme gives me the room to maintain a comfortable sleeping position and so far I have enjoyed plenty of warmth. I also like the bag's heavy-duty zipper.
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