You can not beat this back for the price. I have used mine on countless nights with temps varying from ~25 degrees all the way to ~75 degrees. In the cold it does an excellent job at keeping warmth in. I've never been cold in it (I always wear a thermal top and bottom though). In warmer months it is still great because it vents very well and can actually help to keep you cool. I have had some minor trouble with the zipper on just one occasion, but it wasn't a big deal at all.
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