Mountain Equipment Helium 800 Women's Sleeping Bag (-13°C/9°F)

Perfect for backpacking and trekking in cold conditions. Whether staying in unheated tea-houses in the Himalaya or winter rooms in the Alps, this warm but lightweight bag is the ideal choice. Using 700-fill power DOWN CODEX-approved duck down and a high-performance, 100% recycled Helium 20D outer fabric, the supremely comfortable Helium 800 is warm, lightweight and ultra-compressible for easy packing. Versatile, durable and with expedition-proven features, it excels whether backpacking at altitude or ski touring through winter mountains.

Slant-baffle construction through the body maximises warmth, improves packability and prevents down migration, keeping you warm night after night and preventing cold spots. At the foot of the bag, a four-baffle system focuses warmth around your feet, essential when spending extended time in cold climates, while in the hood, a five-baffle system optimises comfort and keeps the down precisely where it needs to be.

Inside the bag, a 100% recycled Supersoft 20D lining fabric with PFAS-free DWR offers breathability and durability for comfortable nights and a long lifespan, while a full-length Gemini entry zip baffle practically eliminates heat loss in this vulnerable area and is stiffened so it will not catch in the zip. The low-profile magnetic Lode Lock closure and collar drawcords are practical and easy to use in the dark.

Designed with a technical yet comfortable Alpine 2.0 fit, Helium bags optimise thermal performance while minimising weight. With a Good Night's Sleep Temperature of -13°C (9°F), the Helium 800 is a reliably warm and packable bag, perfect for camping, trekking and touring in cold conditions.

Key Features

Insulation

• Insulation optimised baffle-by-baffle for maximum warmth-to-weight ratio
• Regular: 734 g of 90/10 duck down with 700+ fill power
• Long: 772 g of 90/10 duck down with 700+ fill power
• Ethically sourced through DOWN CODEX and RDS 3.0
• Each bag includes a unique DOWN CODEX code for transparency on sourcing and fill power

Materials

• Recycled Helium 20D outer: 38 gsm lightweight recycled 20-denier fabric, windproof with PFAS-free DWR
• Supersoft 20D lining: 38 gsm recycled downproof nylon, breathable and soft against the skin with PFAS-free DWR

Patterning and Design

• Alpine 2.0 fit, a refined tapered shape that optimises thermal efficiency while keeping weight low
• Slanted box-wall baffles reduce structural weight while optimising insulation
• Strategic fill distribution with high-density fill in key areas including the underside, hood and foot box

Foot Box

• Trapezium 4 System: a four-baffle design that enhances warmth and prevents compression around the feet

Hood

• Five-baffle construction for precise down control, low weight and superior insulation
• Spacious yet snug with dual tether drawcords to minimise heat loss

Zip Baffles and Closures

• Gemini full-length entry zip baffle practically eliminates heat loss and is stiffened to prevent snagging
• Lode Lock magnetic closure system for secure, one-handed use in the dark
• Integrated adjustable down-filled neck collar for additional warmth retention

Packed and Storage

• Supplied with a waterproof roll-top stuff sack
• Includes a storage cube to preserve down loft during long-term storage at home

Ideal For

• Backpacking and trekking in cold conditions including high-altitude and winter environments
• Staying in unheated mountain huts, tea-houses or winter rooms
• Ski touring and alpine use where a warm, packable sleeping bag is essential