With this new technology, you may actually want to backpack in the rain. Big Agnes Bellyache Mountain SL mummy sleeping bag features DownTek water-repellent down insulation. FILL. 700-fill duck down. WEIGHT. Long - Left Zip: 2 lbs. 10 oz. Regular - Left Zip: 2 lbs. 7 oz. TEMPERATURE RATING (F). 17 degrees (F)

• DownTek 700-fill-power duck down repels water employing nano technology and a proprietary process to apply 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
• Vertical chambers with internal mesh gates 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
• European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags
• 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 Bellyache Mountain SL mummy sleeping bag includes a mesh storage sack and a nylon stuff sack