Remarkably light and compact, the Marmot Helium Down Sleeping Bag delivers impressive insulation during three-season backpacking and mountaineering treks. Featuring Pertex® Microlight on the exterior, its lofty 800-fill-power-down insulation and water-resistant Down Defender treatment will keep you warm and dry. After an epic day on the mountain, give your feet a rest in the roomy wrap-around footbox. Smooth, curved baffles help keep the fill in place, while the nautilus multi-baffle hood with a drawcord, snagless insulated draft tube, and full-length, two-way zipper with a zip-guard slider limit heat loss. If the interior gets too warm, use the fold-down secondary zipper to get some air. Tuck small items into the internal stash pocket. Features Fold-down second zipper provides added ventilation and easy access, main zipper 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 Certified 800+ Fill Power Goose Down Ultralight Pertex Quantum 20d 100% Nylon Ripstop DWR 1.03 oz/sqyd EN Tested Full length locking YKK two way zipper with zip-guard slider Down Defender to Improve water-resistance in wet conditions Nautilus multi-baffle hood Internal stash pocket Snagless insulated draft tube Hood draw cord Two way zipper sliders Zipper garage Stretch tricot baffles Two hang loops Stuff and storage sack included Marmot Helium -12°C 800 Loft Lightweight Down Sleeping Bag - Regular L