Warm sleeping bag for cold, high-altitude nights, as long as you wear one or two thin layers. Used it on Mt Whitney Trail Camp and whilst climbing Mt Langley's, camping on both peaks at 12000ft with temperatures going down to -5C. I'm a VERY cold sleeper, so I imagine most people will be toasty in this one. Very nice for the remaining, low-altitude nights I used it. Very soft, generous cut with plenty of wiggle space inside, very nice feel to it, compresses easily and fits well into rucksacks. Considering my needs (mostly late fall and winter, low-level valley camping with the occasional high-altitude, below-zero nights)it's a very good deal under $200. Highly recommended. For colder environments consider something beefier.