The Big Agnes Zirkel SL +20°F mummy sleeping bag is ideal for three-season camping. The attached sleeve keeps you securely attached to your sleeping pad, providing constant insulating warmth. . . .FILL .800-fill goose down .WEIGHT .Long - Left Zip: 2 lbs. 11 oz. .Regular - Left Zip: 2 lbs. 6 oz. .TEMPERATURE RATING (F) .20 degrees (F)

• Superlight, prime 800-fill-power goose down delivers an excellent combination of warmth, light weight, compressibility, durability and value
• Vertical baffle Flow Construction features internal Flow Gates vertical chambers with internal mesh gates that keep insulation from shifting up and down
• Underside insulation has been eliminated and replaced with a sleeve for a Big Agnes pad or any 20-in.-wide sleeping pad, sold separately
• Pertex® Quantum nylon ripstop shell is lightweight and durable, and offers silky softness that enhances the insulation's loft
• Ripstop nylon shell has a water repellent finish to shed water
• Nylon taffeta lining is soft and breathable
• Down-filled collar at the top of the bag seals around the neck to prevent warm air from escaping and cold air from entering
• Continuous oversize draft wedge insulates the connection between the bag and pad to prevent cold air from entering
• Large draft tube located behind the zipper prevents warm air from escaping and cold air from entering
• Built-in pillow sleeve lets you stuff a jacket or a pillow inside
• Interior fabric loops stabilize a sleeping bag liner, sold separately
• 2-way, full-length YKK zipper will zip to another bag with opposite zipper configuration
• Big Agnes Zirkel SL +20°F mummy sleeping bag includes a recycled mesh storage sack and a nylon stuff sack