DESCRIPTION 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 sleeping bag and it's just one of the reasons the 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, and recycled liner and shell fabrics for a healthier environment. ADDITIONAL INFORMATION Innovative trapezoidal baffle construction = thermal efficiency Lightweight and warm 550 Fill Down Zippered internal stash pocket for headlamp, cell phone...or actual stash Quad stitch anti-snag zipper design makes it easy to get in and out Buttery-soft and durable 20D nylon shell fabric Dual locking sliders for venting versatility Expanded, natural fit footbox = more room to wiggle your toes Included stuff sack for quick + easy departures Recycled liner + shell for a happier, healthier planet RESOURCES