Remember 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. 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 Specification:- Short ISO Extreme Rating: -11Adeg / -24AdegC ISO Limit Rating: 21Adeg / -6AdegC ISO Comfort Rating: 32Adeg / 0AdegC Fits to: 5&'; 6" / 167 cm Weight: 2 lb. 7 oz. / 1.1 kg Fill weight: 14.64 oz. / 415 g Stuffed size: 7" x 13" / 18 x 33 cm Regular ISO Extreme Rating: -11Adeg / -24AdegC ISO Limit Rating: 21Adeg / -6AdegC ISO Comfort Rating: 32Adeg / 0AdegC Fits to: 6&'; 0" / 183 cm Weight: 2 lb. 10 oz. / 1.19 kg Fill weight: 16.37 oz. / 464 g Stuffed size: 8" x 13" / 20 x 33 cm Long ISO Extreme Rating: -11Adeg / -24AdegC ISO Limit Rating: 21Adeg / -6AdegC ISO Comfort Rating: 32Adeg / 0AdegC Fits to: 6&'; 6" / 198 cm Weight: 2 lb. 15 oz. / 1.33 kg Fill weight: 18.8 oz. / 533 g Stuffed size: 8" x 14" / 20 x 36 cm