Get Schooled in the Geometry of ComfortRemember the trapezoid from 10th-grade geometry? Turns out, this funky ol shape is ideal for helping sleeping bag baffles retain heat. The trapezoidal baffle construction improves on our best-selling Cosmic 20 sleeping bag-and it's just one of the reasons the Kelty Cosmic Down 20 is still our favorite three-season superstar. We also love the natural-fit foot box for happier feet, and a PFC-free water-repellent coating for a healthier environment.FeaturesInnovative trapezoidal baffle construction = thermal efficiencyLightweight and warm 550 fill downEnvironmental and health friendly C0 and PFC-free DWR fabricsZippered internal stash pocket for headlamp, cell phone or actual stashButtery-soft and durable 20D Nylon shell fabricZipper draft tube with anti-snag zipper design makes it easy to get in and outDual slider for ventilation with locking zippersNatural fit spacious footbox = more room to wiggle your toesComes with stuff sack for quick departuresSpecificationsLongISO Extreme Rating: -11° / -24°CISO Limit Rating: 21° / -6°CISO Comfort Rating: 32° / 0°CFits to: 6' 6" / 198 cmWeight: 2 lb. 15 oz. / 1.33 kgFill weight: 18.8 oz. / 533 gStuffed size: 8" x 14" / 20 x 36 cmMaterialsInsulation: 550FP Duck DownShell material: 20D 400T NylonLiner material: 50D 300T PolyesterSource: Imported Kelty Cosmic 20 Deg 550 Down Sleeping Bag, Long Size, Right-Hand