£499.99 inc. VAT

As efficient a bag as it is possible to make with exceptionally high quality down and optimised fit, this ultralight bag will pack a punch in any high mountain environment during the late spring and summer.

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SKU: 10022848 Category: Tag:


The lightest bag in our Extreme Light range, the Firefly is perfect for summer alpinism and mountaineering, or for self-supported backpacking and trekking trips at lower altitudes.

Using 252g of minimum 900 fill power DOWN CODEX® approved European goose down fill and an extremely lightweight and breathable PLASMA 10-denier fabric, the Firefly is the most efficient bag we make. A flurocarbon-free DWR treatment adds a level of protection from melting snow and condensation.

Throughout the bag, slanted baffles optimally balance thermal efficiency against weight and pack size, while our proven EXL® elasticated stitching system inside the bag minimises dead airspace, reduces drafts, and pulls the liner fabric away from the down allowing it to loft effectively for maximal warmth. In the hood and collar a complex seven baffle system concentrates down for optimum warmth and protection over long-term use, and at the foot of the bag an anatomically shaped footbox with a four baffle system allows the down to loft fully and focuses warmth around your feet.

We use a full-spec zip in the Firefly for increased durability and longevity, compared with lightweight zips often seen on comparable bags. This is combined with a full-length Gemini™ entry zip baffle to dramatically reduce heat loss in this typically vulnerable area. Finally, the low-profile magnetic Lode Lock™ closure and collar drawcords are easy to use in the dark or in difficult conditions.

All of our Extreme Light bags have a tapered Alpine fit that optimally balances weight with warmth, but importantly can still accommodate additional down layers and boots as necessary.

With a Good Night’s Sleep Temperature of -3oC (27oF) the Firefly is ideally suited for high mountain summer alpinism where night time temperatures can still hover around freezing.