Remember the trapezoid from 10th-grade geometry? Turns out, this funky ol&&';; shape is ideal for helping sleeping bag baffles retain heat. The women&&';;s specific Cosmic features trapezoidal baffle construction for increased thermal efficiency-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. Features: Innovative trapezoidal baffle construction = thermal efficiency Lightweight and warm 550 fill down Environmental and health friendly C0 and PFC-free DWR fabrics Zippered internal stash pocket for headlamp, cell phone or actuala | stash Buttery-soft and durable 20D Nylon shell fabric Zipper draft tube with anti-snag zipper design makes it easy to get in and out Dual slider for ventilation with locking zippers Natural fit spacious footbox = more room to wiggle your toes Comes with stuff sack for quick departures Material: Insulation: 550FP Duck Down Shell material: 20D 400T Nylon Liner material: 50D 300T Polyester Specs: Regular Fits to: 6&'; 0" / 183 cm Weight: 2.52 lb. / 1.14 kg Fill weight: 16.37 oz. / 464 g Stuff Sack Size: 8" x 13" / 20 x 33 cm Length: 78 in / 198 cm Shoulder Circumference: 62 in / 158 cm Hip Circumference: 58 in / 147 cm Foot Circumference: 40 in / 102 cm Long Fits to: 6&'; 6" / 198 cm Weight: 2.78 lb. / 1.26 kg Fill weight: 18.8 oz. / 533 g Stuff Sack Size: 8" x 14" / 20 x 36 cm Length: 84 in / 213 cm Shoulder Circumference: 64 in / 163 cm Hip Circumference: 60 in / 152 cm Foot Circumference: 42 in / 107 cm