If you are a lady who gets cold easily, I'd only stick with this bag for the summer. I just recently tested the limit of the bag in mid October at about 10,000ft elevation when it got down to more or less 20 degrees F. This did NOT keep me warm. I had to stick all of my extra clothes in the bag for insulation, used my down jacket as a blanket, and cinched the hood to a tiny hole and plugged it with a beanie. The bag has 3 temperature ratings: the comfort level being in the low 30s F, the limit level being at the 20 F range and the extreme just below 0 F. If you don't want to test the limit of the bag yourself, stick with the comfort level temperature as a guide. Other than that this has kept me warm all summer at high elevations.
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