The Rab Ascent Down Sleeping Bag is made for cold nights where comfort still matters. Its wide mummy shape gives you more room than a tight alpine bag, so side sleeping feels less cramped. The 650FP European duck down provides efficient warmth, while the Pertex Quantum outer helps cut wind across exposed camps.

Rab's L.O.F.T construction uses alternating baffle widths to improve warmth for weight. Sidewall baffles reduce cold spots, and the shaped foot box gives your feet a more natural position. Cold nights are easier when you are not fighting the bag.

The left hand two-way YKK 3/4 length main zip makes entry, venting and adjustment straightforward. A shorter secondary zip lets you free your arms while keeping body heat inside. The internal stash pocket, insulated collar and included stuff sack round out the setup. It suits regular trekking or backpacking trips where warmth, comfort and pack size all matter.

Key Features

• ISO Temperature Ratings: Gives a -5C (23F) comfort rating and a -12C (10F) limit of comfort rating for colder outdoor sleep systems.
• 650FP Duck Down Insulation: Provides lofted warmth with European duck down treated with a Grangers fluorocarbon-free hydrophobic finish.
• Pertex Quantum Outer Fabric: Uses lightweight 20D nylon ripstop to help reduce wind chill while keeping the bag packable.
• L.O.F.T Baffle Construction: Alternating wide and narrow baffles help improve warmth for weight without making the bag feel restrictive.
• Wide Mummy Shape: Gives more sleeping room than a narrow mummy bag, with space for extra layers when temperatures drop.
• Sidewall Baffles: Reduce cold spots and help prevent the sleeper from lying directly on a seam.
• Secondary Arm Zip: Allows arms to be used while the main bag stays closed to retain warmth in cold conditions.
• Insulated Collar And Hood: Hood adjustment and a synthetic insulated neck collar help seal warmth around the head and neck.
• Trip-Ready Storage: Includes a drawcord stuff sack and a zipped storage sack with a water-resistant base for storage between trips.