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    • Helium Men's, Helium Women's  

      Helium Sleeping Bags

      Photo by Hamish Frost

    Efficiently sized, supremely comfortable

    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.

    Built Better

    Enthusing the Alpinist's spirit, the Helium range of bags blend craft with function in an otherwise remarkably simple package. Now made from PFC-Free and 100% recycled fabrics the Helium range also benefits from a new more comfortable, yet technical Alpine 2.0 fit and revised collar in selected models. These bags continue to offer class-leading levels of design and functionality and will keep you warm whether hiking a long distance trail or on a Himalayan trek.

    Features | Fill

    Down is a unique and exceptional insulation. It is more compressible, longer-lasting, and offers better warmth for its weight than any other fibrous insulation, achieving this through a structure that traps maximum still air while weighing as little as possible. All of Mountain Equipment’s down is a by-product of the meat industry, sourced from geese and ducks. The down is removed from the birds at slaughter and processed to make it clean, hygienic and fluffy.

    700 Fill Power Duck Down

    Our premium Duck down sourced from either within Europe or from China. With a cluster content of at least 90% and tested in individual batches to ensure a minimum fill power of 700. Some of the finest duck down available in the world and all DOWN CODEX® approved.


    In 2009 Mountain Equipment became one of the first outdoor brands to introduce independent auditing of our down supply chain. Quietly introduced, without fanfare or press-releases, DOWN CODEX® set out to understand an industry and supply-chain that was largely ignored and certainly little understood.

    All products contain a code that can be entered into our DOWN CODEX® website to trace the down that they contain. Not only can you identify the source of your down but the audit relating to that source and the down batch test results can also be viewed.

    Features | Fit

    The fit of a sleeping bag is crucial in optimising performance. A well-fitting sleeping bag is not only highly comfortable it also reduces dead air space and maximises thermal efficiency.

    • Alpine Fit 2.0

      Slightly more tapered in the upper body and in the legs than our Mountain Fit this fit maximises thermal performance and minimises weight.

    • EXL®

      Our time-tested EXL® system, a patented technology developed to provide extra warmth and extra loft. It adds no weight but minimises dead airspace around the body, reduces drafts, and pulls fabric away from the down allowing it to loft maximally.

    • Shelterstone, Loch Avon, Cairngorms

    Features | Fabric

    Fabric technology is advancing all the time and we continually seek out those fabrics that offer the lowest weight, maximum breathability, compressibility and comfort.

    • Helium 20D

      All the Helium bags in the range use a Helium 20D outer fabric. Helium fabrics are our range of high performance woven downproof fabrics. Lightweight and ultra-compressible, Helium fabrics are the perfect choice for any product where weight and bulk are a prime concern. Their densely woven structure and use of fine denier yarns ensures these fabrics are down-proof, tear-resistant and highly breathable.


      Downproof by construction, they do not use membranes and as such have unimpeded breathability. A nanoscale durable water repellence provides water resistance. Helium fabrics are constantly evolving as our fabric partners develop superior technologies. Weaving is a constantly changing field and in recent years the speed of developments has only increased. Before we commit to any new fabric, however, it undergoes extensive laboratory and field testing. Only the best survive.

    • Supersoft 20D

      The inside of the Helium bags are all lined with 100% recycled Supersoft 20D lining fabric with PFC free DWR, chosen for its breathability and durability.

    Good Night's Sleep Guarantee

    Every Mountain Equipment sleeping bag comes with a separate ‘A Good Night’s Sleep Guaranteed’ temperature rating.

    Helium 250: 1°C/34°F
    Helium 400: -5°C/23°F
    Helium 600: -10°C/14°F
    Helium 800: -16°C/3°F

    Helium 250 Women's: 3°C/37°F
    Helium 400 Women's: -3°C/27°F
    Helium 600 Women's: -8°C/18°F
    Helium 800 Women's: -13°C/9°F

    Features | Baffles

    Baffle structure is crucial to the performance of down sleeping bags. Without it, even the best quality down will not loft and insulate to its full potential. Baffles affect a sleeping bag’s durability, weight, and the migration of down inside them – they are the building blocks from which sleeping bags are made.

    Our neck baffles and entry-zip baffles are vital in reducing the ‘chimney effect’ of hot air flowing out of the sleeping bag’s openings, and are also useful in reducing the ‘bellows effect’ of the movement of a restless sleeper pumping warm air from the bag.

    • Slanted box wall baffle

      A slanted box wall baffle takes the classic box wall and offsets it to reduce thermal bridges and increase thermal efficiency. It also offers improved down migration control. An excellent lightweight construction technique.

    • Lode Lock™ collar closure

      Our Lode Lock™ collar closure with its low profile auto-locating closure combines all the advantages of a magnetic fastener with those of a mechanical lock. Rendering the traditional press-stud collar closure practically obsolete, its one handed quick release closure uses two captivated internal magnets to draw the locking mechanism together and ensure that once connected it cannot be accidentally opened. The result is an insulated collar that is more efficient and easier to operate. The collar’s down density is optimised so it moves with the user and contours to the body, while captive and elasticated drawcords ensure easy adjustment.

    • Gemini™ zip baffle

      Our Gemini™ baffle is found throughout almost our entire line of sleeping bags. It is a unique zip baffle system which replaces the bulky, down hungry twin draft tubes used traditionally on cold weather bags. The Gemini™ system is light, efficient, low bulk and supremely protective. It is grown on to the sidewalls of the sleeping bag: the integrated zip baffle utilises a continuous V-baffle system paired with a shaped and stiffened underside. With a greater contact area than a traditional tubular set-up, heat loss by convection is significantly reduced and radiative heat loss minimised. Tested through every step of its development, it eliminates heat loss almost entirely and at a fraction of the weight and bulk of more traditional methods.

    • Loch Avon, Cairngorms

    Features | Hood and Foot Piece

    The head loses a lot of heat and is very sensitive to changes in temperature, making good hood design crucial to the performance of any sleeping bag. A good hood will also keep the neck warm and reduce the ‘chimney effect’ of hot air escaping the body of the sleeping bag.

    Cold feet can spell the end of a comfortable night’s sleep or even the end of an expedition and we have unrivalled experience in designing innovative sleeping bag foot pieces. By controlling the down in a sleeping bag, the foot is kept warmer, and ensuring the foot piece fits perfectly around the lower body is crucial.

    • DC5 Hood

      A 5 baffle hood that provides high levels of down control, low weight and excellent insulation. Its roominess imparts excellent versatility and, combined with the easy-run dual tether draw cords, superb comfort.

    • Trapezium 4

      A four baffle foot piece featuring our unique Bulls Eye™ Technology and offset Sharks Toe™ foot that is engineered for our lightest technical sleeping bags. Its baffle construction restricts down migration whilst keeping weight and bulk to a minimum.

    • Loch Avon, Cairngorms

    Get some sleep, tomorrow is a big day

    Perfectly adapted, the Mountain Equipment range of synthetic and down filled sleeping bags are the choice of today’s leading alpinists and arctic explorers. Ensuring comfort, protection and reliable warmth in the most extreme of environments. 100% of our down is Down Codex® approved and comes from independently audited and traceable sources.

    Trace your down

    What is the DOWN CODEX code?

    Click here to get a demo code and trace