Don't worry as the rain pours outside your tent, you'll stay dry and warm in the Big Agnes Lost Lake SL down bag that features DownTek water-repellent down insulation. FILL. 700-fill DownTek duck down. WEIGHT. Long - Left Zip: 2 lbs. 4 oz. Regular - Left Zip: 2 lbs. 1 oz. TEMPERATURE RATING (F). 29 degrees (F)

• DownTek 700-fill-power down repels water by employing nanotechnology and a proprietary process that applies a micro-thin polymer to the down
• DownTek down repels water and maintains loft and insulation value, even when exposed to moisture
• Proprietary application process creates a water-repellent, antimicrobial and antibacterial down insulation that actually floats on water
• Insotect Flow Construction features internal Flow Gates, which are vertical chambers with internal mesh gates that keep insulation from shifting up and down
• Traditional style mummy bag is designed without the integrated pad sleeve normally found on Big Agnes System bags, and features full insulation underneath
• Ripstop nylon shell has a water-repellent finish to shed water
• Nylon taffeta lining is soft and breathable
• Down-filled collar at top seals around the neck to prevent warm air from escaping and cold air from entering
• Large draft tube located behind the zipper prevents warm air from escaping and cold air from entering
• Interior fabric loops stabilize a sleeping bag liner, sold separately
• 2-way, full-length YKK zipper zips to other bags of opposite configuration
• Big Agnes Lost Lake SL mummy sleeping bag includes a mesh storage sack and a nylon stuff sack