Known by Volcanologists the world over you'd think this Western Mountaineering Puma MF Down Sleeping was filled with high lofting lava! 9.5in of loft , 36 oz. of 850 fill power down, two densely packed Interlocking Draft Tubes and a full down filled collar will keep you in the ring of fire till 25 below zero. Its VBlock Side Baffle provides phenomenal down control, so necessary in a bag with this much loft . You get a 64in shoulder girth so that there's even room for layering. The MicroLite XP shell has superior breathability while being extremely water resistant. This bundle of warmth weighs in at just 3 lb. 7 oz. total weight. Size: 6ft 0in Length Rating: -25° F Loft: 9.5in Inside Girth (shdr/hip/foot): 64in /56in /39in Fill Wt: 36 oz Total Wt: 3 lb 7 oz Stuff Size: 10in x 20in