Why Choose Black Orca FEATHERLITE Ultralight Camping Sleeping Quilt? Different from traditional sleeping bags, this top quilt forms a diamond shaped gap for use with waterproof mats or air mattresses. A lighter load of a sleep system that offers the same protection from the cold, and a much better down distribution so that feathers don't clog up at the back ending up as deadweight. It weighs a mere 35oz and functions better than a blanket with its "sock bottom" that wraps around your feet to keep you warm. Not many companies would boast a fill power of 700 because it costs more, but that's not what we're going for here. We want to use premium materials for quality gear, because we ourselves use it and fully understand the significance of reliable equipment in the wild. Use this quilt either spread out or sealed at the bottom via hook-and-loop clasps, and enjoy a toasty night in the outdoors.