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Mountain Equipment's Firefly sleeping bag is from their Extreme Light range and uses 900 Fill Power down and some redesigned baffle techniques to produce some of the best performing bags available.
Mountain Equipment says:
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.
Our Verdict
Mountain Equipment's Firefly Down Sleeping Bag is part of their Extreme Light range which are among the highest performing bags available. They use 900 Fill Power down and a new baffle construction technique to achieve some awesome warmth to weight ratio figures. 550grams for a -2C bag is among the best around.
Design wise Mountain Equipment's sleeping bags are superb, the hood and footboxes are particularly well designed with multiple baffle sections to give them shape and structure. The Extreme Light bags have a built in neck collar rather than an out and out shoulder baffle - this saves weight and is pretty good in use.
There's a DWR coating on the outer shell which is PFC free, this will give the bag some resilience to a damp environment. As an ultralight backpacker I think these bags are what dreams are made of (see what I did there?).
- Reviewed by Basecamp Gear
Features
- Alpine Fit 2.0 with revised EXL® system improves comfort and loft whilst maximising thermal efficiency
- Slanted box-wall baffles throughout
- Ground level side seams
- 7 baffle low volume anatomically shaped hood
- 4 baffle anatomically shaped and offset foot-box
- Full length Gemini zip baffle and 140cm zip with low profile grown-on front collar
- Plasma 10D inner throughout with PFC free DWR
- Supplied with waterproof roll-top stuff-sack and storage cube
Specifications
- Regular weighs: 522g (excluding stuff sacks)
- Long weighs: 605g (excluding stuff sacks)
- Packed size: 21 x 18 x 16cm
Temperature Ratings
- Comfort: 4°C / 39°F
- Comfort Limit: -2°C / 28°F
- Extreme: -18°C / 0°F
- Good Nights Sleep Guaranteed*: -3°C / 27°F
*Mountain Equipment use their own 'Good Nights Sleep Guaranteed' rating which they believe is a more accurate number for some sleeping bags and is based not just on the EN test results but on lab testing, their own use, thermal imaging and cold chamber work, along with a lot of data analysis.
Material & Construction
- PLASMA 10D fabrics throughout are incredibly light and breathable with PFC free DWR
- 252g of 90-10 Russian Goose Down with a minimum fill power of 900
- 100% Polyamide outer/inner, Down fill
