Rab Ascent 0 Sleeping Bag - Women's

For backpacking in cold weather, this Rab down sleeping bag provides reliable warmth. It has a wide mummy shape and roomy footbox for sleeping comfort. The 650-fill-power down is light and warm.

Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.

• Filled with 650-fill-power down
• L.O.F.T.™ baffle technology reduces down migration, optimizing heat retention and reducing the packed size
• Sidewall baffle construction increases down loft and provides greater side-sleeping comfort
• Shell is made with 20-denier Pertex® Quantum fabric
• Anatomically fitted hood with a drawcord adjustment to maximize comfort and heat retention
• Internal cordlocks positioned below the collarbones for greater side-sleeping comfort
• YKK® zippered internal stash pocket
• 3D shaped neck collar is filled with recycled Stratus™ insulation
• 2-way YKK® 3/4-length main zipper with synthetic-filled baffle
• YKK® antisnag zipper insert and antisnag internal zipper guard
• YKK® zippered arm access vent with integrated snap closure retains heat during tent-based tasks
• Wide mummy shape
• Anatomically shaped footbox for a relaxed sleeping posture
• Drawcord stuff sack included
• Zippered storage sack with a water-resistant base for home storage