Tally up the ultra light fabric, high quality down and a minimalist design, and the 0F Marmot Lithium 800FP Down Mummy Sleeping Bag stacks up to be Marmots lightest bag for mountaineers and backpackers. Good in conditions down to zero degrees Fahrenheit, the updated design features on this bag help reduce shifting down and increase ventilation. Certified 800 fill power goose down insulation. Ultralight Pertex Microlight 20d 100% nylon ripstop DWR 1.03 ozsq. yd. shell fabric. 30d 100% nylon DWR 1.09 oz.yd. lining. Fold down second zipper provides added ventilation, easy access. Anti snag slider reduces snagging. Anatomically designed footbox with wrap around construction increases warmth. Smooth curved baffles reduce down shifting. Nautilus multi baffle hood limits heat loss. Filled and finished in Rohnert Park, California. EN tested. Comfort: 9.0F 12.8C Lower Limit: 4.5F 20.9C Extreme: 45.2F 42.9C Full length locking YKK two way zipper with zip guard slider. Down Defender to improve water resistance in wet conditions. Internal stash pocket. Snagless insulated draft tube. Two way zipper sliders. Hood draw cord. Zipper garage. Two hang loops. Stuff and storage sack included.