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

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.

Exceeding the impressive 1500 mm hydrostatic head of the original DRILITE® LOFT™ but with a staggering weight of only 28g/m2, DRILITE® LOFT™ 10D 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.

Ultrasoft™ 10D fabric is used in many of our bags to provide a lightweight, quick drying and exceptionally breathable fabric. With superfine yarns and a densely woven structure to create a lightweight and downproof lining fabric. Weighing just 36g/m² it offers exceptional tear and seam slippage strength for its weight.

DRILITE® LOFT™ 10D is also used to line the foot-box and hood of the sleeping bag. This protects the bag from moisture which might build up from wet socks or feet or from snowmelt from jacket hoods. It also increases resistance to condensation from breathing out moist air, and protects the bag from boots if, in extremis, they have to be stored inside the bag.

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. Trapezoid baffles are lighter in weight than V baffles and offer excellent down control.

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.

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.

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.

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.