The Mountain Equipment Helium 600 Women's Down Sleeping Bag is low in weight and pack size this is a bag that's warm enough for early spring and late autumn use at higher altitudes or northern latitudes.

The Helium 600 Women's Down Sleeping Bag uses 620g of minimum 700-fill power DOWN CODEX-approved duck down and a high-performance, 100% recycled Helium 20D outer fabric, the Helium 600 is extremely warm, lightweight and ultra compressible for easy packing. It's versatile, long-lasting, and ideal for early spring and autumn use at higher altitudes or generally colder northerly latitudes.

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 essential warmth around your feet, 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 won’t 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 -10°C (14°F), the Helium 600 offers reliable warmth in cooler environments or in early spring or autumn at higher altitudes.

Mountain Equipment Helium 600 Women's Down Sleeping Bag Features:

Insulation:

• Optimised baffle-by-baffle for maximum warmth-to-weight ratio.
• Regular: 547g of 90/10 Duck Down with 700+ fill power.
• Long: 576g 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: A lightweight (38gsm), recycled 20-denier fabric that balances durability, compressibility, and weather resistance. Densely woven for wind and heat loss resistance with a PFAS-free DWR finish.
• Supersoft™ Lining: 38gsm 20D recycled downproof nylon for breathability, durability, and next-to-skin comfort. PFAS-free DWR finish.

Patterning & Design:

• Designed for long-term durability and high performance.
• Women’s Alpine Fit: A refined, tapered shape with a zoned EXL® system that improves thermal efficiency while keeping the weight low.
• Slanted box-wall baffles: Reduce structural weight while optimising insulation.
• Strategic fill distribution: High-density fill in key areas (underside, hood, foot box) to prevent down migration and enhance warmth.

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 & Collars:

• Gemini™ Baffle System: A lightweight, low-profile design that minimises heat loss while maintaining protection.
• Lode Lock™ System: A secure, magnetic fastener with a mechanical lock for a one-handed quick-release closure.
• Integrated, adjustable down-filled neck collar for extra warmth.

Additional Features:

• Waterproof roll-top stuff sack: Maximises pack space and keeps gear dry.
• Storage Cube: Preserves down loft for better long-term performance. Ideal for at-home storage.

Mountain Equipment Helium 600 Women's Down Sleeping Bag Specifications:

User Size:

• Regular: 170cm (5 ft 6 in) maximum user height
• Long: 185cm (6 ft 1 in) maximum user height

Weight:

• Regular: 950g (2lb 1.5oz)
• Long: 980g (2lb 2.6oz)

Insulation:

• Duck Down is ethically sourced via DOWN CODEX© and RDS 3.0.
• Regular: 547g of 90/10 Duck Down with 700+ fill power.
• Long: 576g of 90/10 Duck Down with 700+ fill power.

Temperature Ratings (EN13537/ISO23537):

• Comfort: -5°C (23°F)
• Comfort Limit: -11°C (12°F)
• Extreme: -31°C (-24°F)

Good Night's Sleep Temperature:

• -8°C (18°F)

Packed Size:

• 23cm x 22cm x 22cm (9.1in x 8.7in x 8.7in)

Manufactured in:

• Vietnam