"This bag is rated at 0 degrees, and I can say that I have been plenty warm when it was below freezing. I don't know how warm it would be at 0, but it is still a warm bag. The good features about it is that it has a draft collar which can be adjusted seperately from the hood. But there is one wierd feature. At the head end of the zipper they have a two velcro straps that loop through a plastic
ring. When you do this there is still a gap between the ring and the zipper. Besides that it is a good bag and it will keep you warm on high mountain summer trips or fall and spring trips."