Get Schooled in the Geometry of ComfortThe Kelty Cosmic Ultra 0 is the ultimate in a lightweight mummy. We've taken our top-selling Cosmic Bag and added an 800 fill DriDown version, with all the perks too. The new trapezoidal baffle construction improves is ideal for retaining heat-and it's just one of the reasons Cosmic 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 efficiencyPremium lightweight 800 fill DriDownEnvironmental 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 and linerZipper draft tube keeps warm air in while anti-snag zipper makes it easy to get in and outNatural fit spacious footbox = more room to wiggle your toesComes with stuff sack for quick departuresSpecificationsRegularTemperature Rating: 0.0°F / -18.0°CISO Comfort Rating: 18.0°F / -8.0°CISO Limit Rating: 5.0°F / -15.0°CISO Extreme Rating: -33.0°F / -36.0°CBag Shape: MummyWeight: 4.17 lbs / 1.89 kgFill Weight: 35.27 oz / 1000.0 gFits To: 72.05" / 183.0 cmLength: 77.95" / 198.0 cmShoulder Circumference: 62.2" / 158.0 cmHip Circumference: 57.87" / 147.0 cmFoot Circumference: 40.16" / 102.0 cmStuff Sack Size: 10 x 19 in / 25 x 48 cmMaterialsLiner: 20D 400T NylonShell: 20D 400T NylonFill: 800DP DridownSource: Imported Kelty Cosmic Ultra 0 Deg 800 DriDown Sleeping Bag, Regular Size, Right-Hand