Mountain Equipment Helium GT 800 Sleeping Bag (-16°C/3°F)

A warm, comfortable and lightweight bag with a more generous fit for year-round trekking and backpacking in cold conditions. With a more generous fit than the standard Helium range, the Helium GT series is designed for extended use and is exceptionally comfortable for those who like a little more room to move.

Using 884 g of minimum 700-fill power DOWN CODEX-approved duck down and a high-performance, 100% recycled Helium 20D outer fabric, the supremely comfortable Helium GT 800 is warm, lightweight and ultra-compressible for extended cold-weather trips.

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 more generous GT Fit, the Helium GT follows the same tapered shape as the Alpine fit but with a broader profile that does not sacrifice performance. With a Good Night's Sleep Temperature of -16°C (3°F), the Helium GT 800 is a reliably warm and packable bag, perfect for camping, trekking and touring in cold conditions.

Key Features

Insulation

• 884 g of 90/10 pure duck down with a minimum fill power of 700
• 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

• 100% recycled Helium 20D outer shell, exceptionally light and highly breathable with PFAS-free DWR
• 100% recycled Supersoft 20D lining fabric with PFAS-free DWR for comfort and breathability

Patterning and Design

• GT fit, roomy and comfortable, allows for a variety of sleeping positions
• Slanted box-wall baffles throughout
• Mid-level side seams
• Strategic fill distribution with high-density fill in key areas to prevent down migration

Foot Box

• Four-baffle anatomically shaped and offset foot box for focused warmth around the feet

Hood

• Five-baffle anatomically shaped hood for precise down control and superior insulation

Zip Baffles and Closures

• Full-length Gemini zip baffle with 140 cm zip, practically eliminates heat loss and is stiffened to prevent snagging
• Integrated neck collar with Lode Lock magnetic closure for secure, one-handed use in the dark

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

• Year-round trekking and backpacking in cold conditions
• Extended cold-weather trips where a roomier fit and reliable warmth are essential
• Camping, ski touring and alpine use in cold but dry conditions