Western Mountaineering's award winning Ultralite Western Mountaineering has an outstanding reputation for excellent craftsmanship, high quality down, and well thought design. The Ultralite may be the crowning jewel of Western's lineup it is one of our best sellers for good reason. With 59 of shoulder girth and 16 oz. of premium down fill the efficient Ultralite is rated down to 20 degrees. A full down collar adds warmth on frigid nights by preventing heat escape around the shoulders. On warmer nights, continuous baffles allow the down to be pushed from the top of the bag to underneath your body to prevent overheating. Amazingly, the Western Mountaineering Ultralite weighs only 1 lb 13 oz. and compresses to a shockingly small size. Features and Benefits a Breathable, durable, and water resistant Microlite XP microfiber finish. a 5 14 SpacingContinuous baffles keeps insulation where it belongs. a 6246 ShoulderFoot Girth. a 5 Loft, 25Adeg F rating a 19 oz. Down Fill. a Just 2 lbs. total weight.