Looking for the absolute warmest bag around? Go for the Men's CWM -40 Sleeping Bag. Built to handle temps as low as -40 degrees F, this bag is a must-have for epic adventures. Premium 800-fill-power down plus waterproof Pertex Shield Fabric keeps you warm and dry in inclement weather, and center and dual side zips make it easy to climb in and out. Features: RDS Certified 800-fill-power goose down provides exceptional warmth, loft, and compactibility Pertex Shield fabric with waterproof, windproof, breathable membrane Center zipper for easy access; dual side zippers for ventilation and to allow arm use Multiple internal storage pockets Multi-baffle, wraparound foot box increases warmth; reinforced footbox lining Internal hood and draft collar cord cinch to prevent heat loss Specifications: Bag Temperature Celcius: -40C Bag Temperature Fahrenheit: -40F Footbox Size: 44.1 in, 112 cm Hip Girth: 56.7 in, 144 cm Includes Compression Stuff Sack: Yes Includes Storage Sack: Yes Includes Stuff Sack: No Insulation Material: 800 Fill Power, Goose Down Insulation Type: Down Shoulder Girth: 63 in, 160 cm Stash Pocket: Yes Stuff Sack Size: 22.0 x 12.2 in, 56 x 31 cm Style Number: 37040 Product Weight: 4 lbs 15.9 oz,2,266.0 g Zipper Location: Center Zip Marmot Men's CWM -40 Center Zipper Sleeping Bag - Clear Blue/Black