Stay nice and warm while camping with the Patagonia Insulated Down Sleeping Bag. Featuring a ripstop nylon Pertex Quantum exterior, this sleeping bag functions in temperatures as low as 19F/-7C. Ideal for extreme adventurers, the Down Sleeping Bag also has a Houdini nylon fabric interior. With this, it dries quickly and easily while remaining super soft against your skin. In addition to these fabrics, the Down Sleeping Bag uses an 850-fill-power goose down.