Remember the trapezoid from high school geometry? Turns out, this funky ol'shape is ideal for helping sleeping bags retain heat. Their trapezoidal baffle construction is just one of the reasons the Cosmic Down is still their favorite three-season superstar. They also love the expanded natural-fit footbox for happier feet, zippered stash pocket and fully recycled fabrics and PFAS-free DWR treatment. The Cosmic Down is the total package. FeaturesTrapezoidal baffle construction provides enhanced thermal efficiencyLofty, lightweight and warm 550 Fill DownButtery-soft and durable, fully-recycled shell and liner fabrics with PFAS-free DWRZippered internal stash pocket keeps your favorite devices close at handFull draft tube and collar retain heat and enhance comfortQuad-stitch anti-snag zipper makes getting in and out easyDual locking sliders for venting versatilityExpanded, natural fit footbox = more room to wiggle your toesStuff sack included, for quick and easy departures