The LITHIC 35-Degree Down Sleeping Bag is an ultralight sleeping bag for 3-season backpacking trips. Insulated with 600 fill power down, it weighs less than two pounds and compresses into a water-resistant stuff sack to keep bulk to a minimum. The 20D polyester shell fabric features a water-repellent finish to protect the precious down and preserve warmth in wet or humid conditions. Other features include a no-snag zipper, which allows you to get in and drift off to dreamland with ease. All of that, and it won t bust a hole in your wallet.Comfort tested to 35°F, this sleeping bag is suitable for 3-season use. 600 Fill Power Down provides excellent warmth while keeping the sleeping bag lightweight at just 1 lb 14 oz. The ultralight 20D Nylon Shell is treated with a durable water-repellent coating to protect the down filling and keep you dry in wet conditions. Contoured hood with drawcords keeps heat in on the coldest nights. No-Snag YKK Zipper ensures you that you can get in and out with ease. Packs down small in the included stuff stack thanks to lightweight, compressible down fill.