The Rab Ascent Pro 800 down sleeping bag is made for winter nights where warmth, protection, and room to move all matter. With 800g (28.2oz) of 650FP European duck down, it gives serious insulation for cold conditions while keeping the fit generous enough for added layers when the temperature drops.

The wide mummy shape is the big comfort win here. It gives tired legs and shoulders more space than a tight alpine cut, without turning the bag into a heat-leaking rectangle. The angled foot box also helps you settle into a more natural sleeping position.

Rab pairs the down fill with a Pertex Quantum Pro ripstop outer and Nikwax fluorocarbon-free hydrophobic finish, so the bag is better prepared for wind, condensation, and damp camp conditions. Inside, trapezoidal box wall baffles help the down loft properly, while the 3D neck collar and down-filled zip baffle work to keep warmth where it belongs.

A cold night exposes weak kit quickly. This is the bag to reach for when you want winter-level warmth, a little more sleeping room, and weather-resistant protection without moving into full expedition-bag bulk.

Key Features

• Winter Down Warmth: Filled with 800g (28.2oz) of 650FP European duck down for cold-weather insulation.
• Wide Mummy Shape: Gives more room than a narrow mummy bag while still helping retain warmth.
• Pertex Quantum Pro Outer: Adds wind and water resistance for exposed bivis, snow-holing, and damp conditions.
• Hydrophobic Down Finish: Nikwax fluorocarbon-free treatment helps the down cope better with moisture.
• Box Wall Construction: Trapezoidal baffles support full down loft and help reduce cold spots.
• Heat-Sealing Details: A 3D neck collar and down-filled zip baffle help limit heat loss overnight.
• Practical Storage: Includes an internal zipped stash pocket, stuff sack, and cotton storage sack.