Stuffed with 6 oz of 800 fill down, this jacket packs more down in than some summer weight sleeping bags! With an overall weight of just 16 oz, combined with MontBell's usual level of quality (extremely high), this jacket finds a home in one or another of my packs in all seasons. It makes a great winter camping layering piece, keeping me warm and cozy while standing around down around 0 degrees (and maybe colder, haven't tried), and during the other seasons it finds a home in my SAR pack as an alternative to carrying a sleeping bag for any unplanned bivouacs. Truly a quality piece of functional outdoor gear. 5 Stars!