The highest quality 800-fill-power goose down and a waterproof shell make this the right bag for serious mountaineering in extreme conditions. FILL. 800-fill goose down. TEMPERATURE RATING (F). -20 degrees Fahrenheit

• Marmot MemBrain® shell is breathable, down-proof and waterproof
• Lofty, premium 800 fill-power goose down offers superb warmth for minimal weight; meticulously cleaned and processed for hypo-allergenic qualities
• 9-baffle chest section provides maximum goose down control for warmth and durability
• 6-Baffle Hood envelops your head in warmth; Face Muff allows hood to be cinched snug without digging into your face
• No more midnight drawcord fumbling smooth, flat upper cord and hard, round lower cord make hood adjustments easy
• Hood closure system stays closed without the use of rip-and-stick and also keeps the drawstring and zipper away from your face
• Spacious 11-baffle footbox allows down to loft fully; footbox is reinforced to handle extra abuse of boot liners and water bottle
• Down-filled draft collar increases warmth; hidden pocket in down-filled draft tube keep small items like lip balm or your watch warm and accessible
• Zipper guards prevent zipper snags; locking, full-length zippers keep bag from opening in the night
• Comes with nylon stuff sack and a storage bag