Remarkably light and compact, the 15 Marmot Helium 800FP Down Mummy Sleeping Bag delivers impressive insulation. Use it as a three plus season bag to substantially reduce your load while backpacking and mountaineering. Features, like a curved baffle design that reduces the shifting of down, increase the comfort on this 800 fill power goose down bag. 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: 25.2F 3.8C Lower Limit: 13.5F 10.3C Extreme: 20.6F 29.2C 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. Stretch tricot baffles. Two hang loops. Stuff and storage sack included.