Alpine(TM) UL1100 Mummy Down Sleeping Bag -6.5degF/ -21.4degC

Alpine(TM) UL Professional Mummy Down Sleeping Bag with 850FP white goose down and thermal-efficient triangular baffle construction - delivering scientifically tested warmth for extreme cold conditions, engineered for serious mountaineers and winter backpackers. Key Features Premium 850FP White Goose Down InsulationFilled with 95% high-quality 850FP white goose down, certified by RDS (Responsible Down Standard) and independently tested for fill power (865 in^3), loft, and purity - delivering exceptional warmth-to-weight ratio for extreme alpine conditions. Triangular Baffle Construction for Maximum Thermal EfficiencyEngineered with triangular baffle design that keeps down evenly distributed, prevents cold spots, and promotes faster lofting - achieving the same warmth as traditional square baffle systems with significantly less fill weight, as validated by lab testing. Scientific Temperature Ratings with ISO StandardsThermal values precisely measured using a heated manikin system in accordance with ISO 23537 - providing reliable comfort, limit, and extreme temperature references you can trust for backcountry decision-making. Premium Materials & Thoughtful DetailsOuter and lining crafted from 10D 500T down-proof calendered nylon with a sleek finish, featuring a YKK anti-snag zipper, Duraflex buckles, a warm hood with drawcord adjustment, and an interior storage pocket - every detail built for reliability in harsh conditions. Compact Packability with Versatile Storage OptionsIncludes three storage solutions - mesh storage bag for long-term loft preservation, stuff sack for travel, and compression sack for space-saving packability - so you can choose the right balance of volume and protection for your adventure.