The Rab Ascent is aimed at outdoor users who want dependable warmth, practical comfort, and a sleeping bag that feels less restrictive after a long day on the trail. Its 650FP European duck down insulation delivers solid cold-weather performance, while the wide mummy shape provides more room than many traditional alpine-focused bags.

Comfort has been built into the design from top to bottom. Sidewall baffles help reduce cold spots, the anatomically shaped foot box allows a more natural sleeping position, and the insulated neck collar helps keep valuable warmth where it belongs. If you tend to sleep on your side, the internal cordlock placement and baffle layout make a noticeable difference through the night.

One of the standout features is the secondary arm zip with integrated snap closure. It allows you to reach outside the bag for camp tasks, reading, or cooking while still retaining much of your body heat. Small details such as the internal stash pocket, anti-snag zip protection, and included storage solutions add further everyday practicality.

Cold nights feel much longer when your sleeping bag is working against you. The Ascent focuses on warmth, comfort, and usable space, making it a strong choice for regular trekking, backpacking, and mountain adventures where reliable overnight performance matters.

Key Features

• 650FP Duck Down Insulation: Provides dependable warmth with a strong balance of thermal performance and packability.
• L.O.F.T. Baffle Construction: Alternating wide and narrow baffles maximise warmth while keeping weight under control.
• Wide Mummy Shape: Gives extra room to move and allows space for additional layers in colder conditions.
• Sidewall Baffles: Help reduce cold spots and prevent you from lying directly on seam lines.
• Secondary Arm Zip: Lets you use your arms outside the bag while retaining warmth inside.
• Integrated Snap Closure: Helps hold warmth around your body when using the secondary zip.
• Adjustable Hood: Cinches down to reduce heat loss around your head and face.
• Synthetic Insulated Collar: Sits comfortably around the neck to help trap warm air.
• Anatomical Foot Box: Creates a more natural sleeping position with extra space around the feet.
• Internal Stash Pocket: Keeps small essentials and valuables close at hand overnight.
• Internal Cordlocks: Positioned below the collarbone for improved comfort when side sleeping.
• Two-Way YKK Main Zip: Allows flexible ventilation and easier temperature regulation.
• Synthetic-Filled Zip Baffle: Helps minimise heat loss along the zip line.
• Anti-Snag Zip Insert: Reduces the chance of fabric catching during use.
• Drawcord Stuff Sack: Compresses the bag for transport and storage in your pack.
• Storage Sack Included: Helps maintain down loft during long-term storage at home.
• UK Hand-Filled Construction: Preserves down loft by using down that has not been compressed before filling.
• PFAS-Free Materials: Uses fluorocarbon-free treatments across fabrics and insulation finishes.