Mountain Equipment Firefly (250)

From £405.00
£450.00
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As efficient a bag as it is possible to make with exceptionally high quality 900 fill power down and optimised fit, this ultralight bag is ideal for any high mountain environment during the late spring and summer. It should give a good night's sleep in temperatures as low as -3°C (for men).

Mountain Equipment Firefly (250)

Regular Left Zip
£405.00
£450.00
Save 10%
3 In Stock
Long Left Zip
£432.00
£480.00
Save 10%
2 In Stock

As efficient a bag as it is possible to make with exceptionally high quality 900 fill power down and optimised fit, this ultralight bag is ideal for any high mountain environment during the late spring and summer. It should give a good night's sleep in temperatures as low as -3°C (for men).

  • Plasma 10D fabrics throughout are incredibly light and breathable with PFC free DWR.
  • Fill is 90-10 Goose Down with a minimum USA fill power of 900.
  • Alpine Fit 2.0 improves comfort and maximises thermal efficiency.
  • Slanted box-wall baffles throughout.
  • Ground level side seams.
  • Seven baffle anatomically shaped hood.
  • Four baffle anatomically shaped and offset foot-box.
  • Full length Gemini zip baffle with 140cm zip and integrated neck collar.
  • Plasma 10D inner throughout with PFC free DWR.
  • Supplied with waterproof roll-top stuff-sack and storage cube.

100% Polyamide outer and inner, Down fill.

ME Firefly Fill Weight Internal Length Shoulder Width Foot Width Packed Size Weight
Regular 252g 185cm (6' 1") 75cm 50cm 21cm x 18cm x 16cm 550g
Long -g 200cm (6' 7") 75cm 50cm - -g
ME Firelite
Fill: 900+ USA fill power goose down
Comfort: 
Comfort Limit:
Extreme:
-4ºC 
-2ºC
-18ºC
 
EN Sleeping Bag Temperature Ratings
EN13537 is the European standard for sleeping bags and requires a thermal manikin test which produces four temperature results — upper limit, comfort, lower limit and extreme. There is no legal obligation to use this standard though most reputable brands do, even non-European ones. There is an exemption for military sleeping bags and sleeping bags for extreme temperatures, ie a comfort range of below -25°C. 
Upper Limit: the temperature at which a standard man can sleep without excessive perspiration. It is established with the hood and zips open and with arms outside the bag.
Comfort: the temperature at which a standard woman can expect to sleep comfortably in a relaxed position.
Lower Limit: the temperature at which a standard man can sleep for eight hours in a curled position without waking.
Extreme: the minimum temperature at which a standard woman can remain for six hours without risk of death from hypothermia (though frostbite is still possible).
For the purpose of these measurements, a "standard man" is assumed to be 25 years old, with a height of 1.73m (ie 5' 7", not very tall) and a weight of 73kg; a "standard woman" is assumed to be 25 years old, with a height of 1.60m (ie 5' 2.5") and a weight of 60kg.

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