Altitude AtII Down Sleeping Bag Women's - Regular -10C

Warm, Spacious, and Versatile for Backcountry Comfort.

The Sea to Summit Altitude AtII Down Sleeping Bag is designed for women who want reliable warmth, extra room, and adaptable ventilation for backpacking and alpine adventures. Filled with RDS-certified 750+ fill power ULTRA-DRY Down™, it combines high thermal efficiency with moisture resistance for cold, damp conditions.

A relaxed, tapered rectangular shape offers more space for side sleepers, while a breathable 20D nylon shell with non-PFAS DWR keeps the bag lightweight and packable. Vertical chest baffles prevent down migration, and THERMOLITE® panels in the footbox add warmth where it’s needed most. The Free-Flow triple-zip system allows for multiple ventilation options, including full quilt-style opening. An oversized hood, draft tubes, and an internal security pocket round out the comfort-driven design.

Includes an Ultra-Sil compression sack for efficient packing.