The Sea to Summit Ascent Down Sleeping Bag (-9°C) is a highly adaptable three-season bag designed for colder backpacking conditions. Packed with 750+ fill power Ultra-Dry goose down, it offers excellent warmth, moisture resistance, and comfort. The Free-Flow Zip system allows multiple ventilation configurations, making it suitable for a wide range of temperatures.

Features

• Designed for backpacking and demanding three-season backcountry use

• RDS-certified 750+ fill power goose down with non-PFC Ultra-Dry Down treatment for improved moisture resistance

• Free-Flow Zip system allows multiple ventilation options and sleeping bag configurations

• Can be opened fully and used as a quilt in warmer conditions

• Relaxed mummy shape provides thermal efficiency with extra comfort and movement

• Technical hood with drawcord adjustment for improved heat retention in colder weather

• Draft-tube protected zippers reduce cold air entry and heat loss

• Box baffle construction maximises warmth distribution across the bag

• Vertical torso baffles minimise down movement and maintain insulation performance

• Lightweight 20D recycled nylon shell with non-PFC DWR finish protects against wind and moisture

• Soft 20D recycled nylon liner for improved comfort

• Hood designed to fit a Sea to Summit Aeros pillow

• Compatible zip coupling with selected Sea to Summit Women's bags for two-person sleeping space

• Footbox zipper and shoulder snaps allow the bag to be worn around camp

• Includes a durable bluesign APPROVED recycled nylon compression sack