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

A warm, lightweight and supremely comfortable sleeping bag, offering a roomier fit for year-round backpacking and trekking in colder climates.

The Helium GT series, boasting a more generous cut than the standard Helium range, has been purposefully crafted for prolonged use. It delivers outstanding comfort to those who appreciate additional space to move. Filled with 884g of ethically sourced duck down (minimum 700 fill power) certified by DOWN CODEX, and enveloped in a high-performance, 100% recycled Helium 20D outer fabric, the Helium GT 800 provides excellent warmth, minimal weight and exceptional compressibility for longer cold-weather expeditions.

Its slanted baffle design throughout the body boosts thermal efficiency, enhances packability and secures the down insulation in place to prevent cold spots from forming. A specialised four-baffle system at the foot of the bag concentrates warmth precisely where it's needed most—around the feet—while a five-baffle hood construction ensures comfort and maintains consistent down distribution around the head.

Internally, the sleeping bag is lined with a 100% recycled Supersoft 20D fabric treated with a PFAS-free DWR, offering a blend of breathability, resilience and next-to-skin comfort. A full-length Gemini™ zip baffle is reinforced to avoid snagging and significantly reduces heat loss through the zip area. Additionally, the low-profile magnetic Lode Lock™ closure and easy-to-locate collar drawcords are designed for convenience, especially in low-light conditions.

Tailored with the roomier GT Fit, the Helium GT retains the tapered Alpine shape while offering a broader silhouette that doesn’t compromise thermal performance. With a Good Night’s Sleep temperature rating of -16°C (3°F), the Helium GT 800 is a reliably warm and compressible sleeping solution for trekking, touring and camping in dry, cold conditions.

Features

• The outer shell is made from 100% recycled HELIUM 20D fabric, which is ultralight, highly breathable and treated with a PFAS-free DWR.
• It is insulated with 844g of 90-10 Pure Duck Down, offering a minimum fill power of 700 for high thermal efficiency.
• The GT fit provides extra room and comfort, accommodating a range of sleeping positions with ease.
• Slanted box-wall baffle construction throughout enhances loft and reduces down migration.
• Mid-level side seams balance thermal performance and structural integrity.
• The hood features five anatomically shaped baffles for precise down control and improved comfort.
• A four-baffle anatomically contoured foot-box is offset to concentrate warmth around the feet.
• The full-length Gemini zip baffle includes a 140cm zip and integrated neck collar, secured with the Lode Lock magnetic closure for minimal heat loss.
• A 100% recycled Supersoft 20D lining fabric, treated with a PFAS-free DWR, provides breathability and a soft, durable interior.
• Supplied with both a waterproof roll-top stuff sack and a breathable storage cube for versatile packing options.

Specifications

Technology

	Good Night's Sleep Guarantee Our “Good Night’s Sleep Guarantee” allows you to purchase a new sleeping bag with confidence. We’re so confident in our “Good Night’s Sleep Temperature” rating that if you decide your new sleeping bag isn’t quite warm enough, we’ll upgrade your bag to one with a warmer specification.
	Down 700 Down is the finest insulator that we have. Its warmth to weight ratio, compressibility, long lifespan, and softness are yet to be matched by manmade insulations. For all but the most serious expeditions, duck down is a great choice for both insulated clothing and equipment.
	Helium Helium fabrics are exceptionally light, compressible and soft. Their densely woven construction ensures the highest levels of down-proofing and wind resistance.
	Down Codex® The DOWN CODEX® is our multi-award-winning certification scheme that considers the environmental, ethical and animal welfare matters relating to our down supply chains. It is grounded in comprehensive and transparent auditing that ensures traceability and quality.

Detailed Shots

	Using slanted box-wall baffles throughout the entire main body of the helium bags means weight is removed from the bags structure yet they remain a significant step above a standard box baffle.
	4 baffle anatomically shaped and offset foot-box.
	5 baffle anatomically shaped hood.
	Full length Gemini zip baffle with 140cm zip and integrated neck collar with Lode Lock closure.
	Integrated neck collar with Lode Lock closure.
	100% recycled HELIUM 20D outer shell is very light and highly breathable with PFC free DWR.

More Information

Helium Sleeping Bags

Efficiently sized, supremely comfortable and low in weight each Helium bag offers outstanding all-round performance for backpackers, cycle-tourers and trekkers. These bags don’t skimp on features and will keep you warm and comfortable whether on a summer road-trip or extended trek.

Shop The Helium Range

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