Mountain Equipment Helium GT 600 Sleeping Bag (-10°C/14°F)

Light, packable but with a slightly more generous fit, this is the ideal bag for long trekking and backpacking trips through spring and autumn. 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 656 g of minimum 700-fill power DOWN CODEX-approved duck down and a high-performance, 100% recycled Helium 20D outer fabric, the Helium GT 600 is extremely warm, lightweight and ultra-compressible for extended trekking and backpacking trips through spring and autumn.

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 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 -10°C (14°F), the Helium GT 600 offers reliable warmth in cooler environments or in early spring or autumn at higher altitudes.

Key Features

Insulation

• 656 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

Specifications

Ideal For

• Extended trekking and backpacking through spring and autumn
• Early spring and autumn use at higher altitudes or colder northerly latitudes
• Those who prefer a roomier fit without sacrificing packability or warmth

Care Instructions

Technology

	Down 700 Mountain Equipment's 700 fill power duck down sits in the sweet spot of price and performance, offering excellent quality for all but the most serious use. Being down, it has a superb warmth-to-weight ratio, compressibility, lifespan and softness.
	DOWN CODEX Since 2009, Mountain Equipment's DOWN CODEX programme has set high ethical standards for down sourcing, eliminating live-plucking and force-feeding, and ensuring only top-quality virgin down is used, certified to the Responsible Down Standard (RDS).
	Helium Helium fabrics are exceptionally light, compressible and soft. Their densely woven construction ensures the highest levels of down-proofing, fibre resistance and wind resistance, ensuring lasting performance despite their extremely low weight.