FeaturesUltralight down mummy bags that feature 850 fill power DownTek™ down and a Pertex® shell to create our most compressible, technical bags Traditional mummy shape allows for lightweight and increased thermal value Body mapped baffle construction optimizes thermal efficiency 3-D anti-snag draft tube prevents heat loss along the zipper Vertically structured sidewalls integrating contoured baffles trap heat closer to the body Contoured hood baffles cradle the head for a more comfortable fit Oversized interior anti-draft collar Ergonomic foot-box construction provides more loft and warmth Low-profile cordlock lets you un-cinch the hood with one hand Insulated tube along upper hood opening seals out drafts when cinched Minimal zipper minimizes weight and reduces cold spots 40"/102cm YKK #5 anti-snag zipper for a smooth, quick zip Zipper Garage Interior fabric loops for sleeping bag liners Streamlined exterior loops for hang drying or storage Storage sack & stuff sack included Construction + MaterialsShell and lining are Pertex® Quantum nylon rip-stop 100% recycled Pertex® Quantum uses a tightly woven structure made from incredibly fine yarns, making a light and soft fabric that allows insulation to fully loft and maximize thermal efficiency 850 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFOA and PFOS free water repellent chemistry Insotect Flow™ vertical baffles contour to your body to provide a more comfortable fit and keep you