Welcome to Western Mountaineering Sleeping bags! Simply the best! If your planning a thru hike, doing the JMT, or just going hiking, fishing or hunting then the UltraLite is a great choice. When Western Mountaineering says good to 20Adeg they mean it. Compare the loftiness next to your friends "20Adeg" bag and you will see the difference. The full down collar helps to seal in heat around your neck without adding excess bulk, and 16 oz. of high lofting down pumps this bag to 5". The total weight of this very compressible package is only 1 lb. 13 oz. Another reason to buy Western Mountaineering: It is a small business like ours, run by people who love the outdoors. This bag is wide, warm, and packed with features. With a 3-dimensional full down collar, a full-length YKK zipper, and 5" of loft, the Alpinlite has quickly become one of our most popular models. Our award winning Ultralite has been a favorite among lightweight backpackers for more than a decade. The Alpinlite is just a wide version of that great bag. There are many 20Adeg down mummy bags on the market, but none have the width, warmth, or loft of this bag. Eastside Sports is owned and operated by former(for now) thru hikers. The owners are PCT SOBOs from 2015. Past employees who are still around but now retired hiked the PCT in the 1970s and 1980s. Other employees were former backcountry rangers from several different national parks. Features Full Down Collar 5" Loft, 20Adeg F 5 1/4" Spacing/Continuous Baffles 19 oz. Down Fill 64"/39" Shoulder/Foot Girth Full-length #5 YKK Zipper 1 lb. 15 oz. Total Weight TECH SPECS SHAPE SIZE (FT/IN_ RATING LOFT (IN) INSIDE GIRTH SHDR/HIP/FOOT (IN) FILL WT. TOTAL WT. STUFF SIZE (IN) MUMMY (W/FULL COLLAR) 5&';6" 20F 5.5" 63"/56"/39" 17OZ 1LB 13OZ 7"X13" MUMMY (W/FULL COLLAR) 6&'; 20F 5.5" 64"/55"/39" 19OZ 1LB 15OZ 8"X15" MUMMY (W/ FULL COLLAR) 6&';6" 20F 5.5" 65"/56"/39" 21OZ 2LB 1OZ 8"X15"