Extreme Alpine Sleeping Bags

Our very best Eastern European goose down, with an actual minimum down cluster content of 90% and individually tested to ensure a minimum fill power of 800 cubic inches & DOWN CODEX® approved.

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.

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.

Our Extreme Alpine bags use our Expedition Fit. A more generous fit that’s both longer and wider, these bags afford greater comfort when used for longer periods of time but also enable additional clothing to be worn or stored inside the bag more easily.

Our time-tested EXL® system is also used in these bags. 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 fully.

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

DRILITE® LOFT™ 10D outer fabric is a class-leading fabric for the most serious users. It’s amongst the lightest, highly water-resistant shell fabrics in the world. Ideal for Super Alpine climbing and the most lightweight expeditions, where protection, pack size, and weight are critical to success and even survival.

DRILITE® LOFT™ 10D is also utilised to line the footbox and hood of the sleeping bag. This lining helps protect the bag from moisture that may accumulate from wet socks, feet, or snowmelt from jacket hoods. Additionally, it enhances resistance to condensation caused by breathing out moist air or from boots that may need to be stored inside the bag in extreme conditions.

The rest of the lining is an Ultrasoft™ 10 denier fabric which is lightweight, quick drying and exceptionally breathable.

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 Extreme Alpine Sleeping Bags use a variety of baffle constructions to ensure maximum performance.

Horizontal 14:7 trapezoid baffles are a premium construction method for exceptional sleeping bags. They offer excellent overlap of baffles, reducing thermal bridges and the associated conductive heat loss. This means less down is required to keep you warm, especially under prolonged use. In trapezoid 14:7 baffles, side-walls form the ‘magic angle’ that maximises strength and stability to offer excellent down control and loft.

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 captive 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.

Our Gemini™ zip 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 onto 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.

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.

DC7 LV Hood

7 baffles provide exceptional down control for long-lasting performing and excellent insulation. Smaller than our previous headline hoods, the DC7 LV reduces weight, has less deformation when cinched down small, and offers single handed closure and easy-run dual tether draw cords for greater ease of use in extreme conditions.

Trapezium 6

A six baffle foot piece, our most advanced design, and featuring both our Bulls Eye™ Technology and offset Sharks Toe™ foot constructions. Its highly sophisticated baffle system maximises thermal efficiency for the coldest and most demanding environments, ensuring warm feet night after night.