I use mine quite a bit and like it a lot. If the temperature is much below about 10 degrees then it starts to get quite cold...I've slept in temps below freezing in it and had very uncomfortable nights sleep (read half frozen to death) even in a very good down bag as there's no insulation under you as the downs compressed so looses its insulating properties. Kept me dry in pretty heavy rain too!
I like them though and would recommend them!
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