The Anvil Horn 15 deg offers a roomy, rectangle-shaped sleeping space with Downtek (TM) PFC-Free insulation and an integrated Flex Pad Sleeve on the bottom. With technical fabrics and construction, compressible insulation, and tons of comfort features, these comfortable sleeping bags are designed to be lightweight enough for backpacking but cozy enough you'll want them in the campground too. The streamlined silhouette and Insotect Flow (TM) construction increase the thermal efficiency keeping you warm from head to toe. The Flex Pad Sleeve unites easily with your pad, and as you change positions over the course of the night, will keep you from rolling off your pad. Big Agnes Anvil Horn 15 Sleeping Bag | Christy Sports