The Big Agnes Mystic UL 15 Degree Sleeping Bag is a down bag for backpacking in temps down to 15°F. The Insotect Flow construction distributes heat evenly, keeping the 850 fill down closer to the body. Treated with DownTek, the Insulation also resists moisture, so any damp adventures remain a little bit happier. The rectangular shaped bag Features a full pad sleeve so you won't roll off it in the night. Cinch the hood down and sleep warm. Features of the Big Agnes Mystic UL 15 Degree Sleeping Bag Design improves connection between pad sleeve and bag providing a roomier sleeping space without adding bulk Sculpted contour allows the bag to drape around you, increasing Insulation Performance Free range hood design ? gives you the freedom to lift your head while snuggled in the hood Low profile cord lock lets you un-cinch the hood with one hand Tapered vaulted foot box creates wiggle room for your feet with out creating large cold air pockets Stretch fabric panel beneath hood creates a designated pillow pocket DownTek water repellent down repels water while maintaining insulating value Integrated full pad sleeve Rectangular shaped bag Superlight shell fabric with High tear strength Zipper garage Mate together left and right zip bags No-draft collar, No-draft wedge, No-draft zipper Interior fabric loops for sleeping bag liners Exterior loops for hang drying or storage Mesh storage sack and nylon stuff sack