Remeber 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 Kelty’s best selling Cosmic 20 sleeping bag – and it’s just one of the reasons the Kelty Cosmic Down 20 is still Kelty’s favorite three-season superstar. The natural-fit foot box makes for happier feet, and a PFC-free water-repellent coating is used for a healthier environment.Features:Innovative trapezodial baffle construction = thermal efficiencyLightweight and warm 550 fill downEnvironmental and health friendly CO and PFC-free DWR fabricsZippered internal stash pocket for headlamp, cell phone or actual stashButtery-soft and durable 20D Nylon shell fabricFull draft tube and collar retain heat and enhance comfortQuad-stitch anti-snag zipper makes getting in and out easyDual slider for ventillation with locking zippersNatural fit spacious footbox = more room to wiggle you