Mountain Equipment Firefly Long Left Zip
As efficient a bag as it is possible to make. Inspiring confidence even when water turns to ice, this ultralight bag will pack a punch in any high mountain environment during the late spring and summer.The lightest, most efficient bags we have ever developed. If you want reliable warmth for minimum weight, look no further. Their advanced design and cutting edge fabric technology has opened up a new standard in superlight bag construction. Developed for alpinists, ultra-distance backpackers and mountain athletes these bags will help you reach your destination faster, more efficiently and more comfortably than ever before.

By utilising slanted box-wall baffles throughout the entire main body, meaningful weight is removed from the bag’s structure. On the inside of the bag the conventional neck collar is replaced by a significantly lighter collar baffle (which also allows higher concentrations of down to be placed within the main body of the bag) and EXL® has been added to the top half of the bag to minimise dead air space, reduce drafts and pull fabric away from the down to maximise loft.

This is balanced with ground level side-seams which help to manage a greater concentration of the overall down fill in a larger-volume top half whilst improving thermal resistance. In spite of this, density differences mean that the top section of the bag accounts for just under half of the total fill-weight whilst those individual sections of the bag most prone to compression such as the underside and foot-piece make use of higher down densities to maximise thermal resistance from a lower mass of fill.

With extremely light and air permeable fabrics, the EN13537 test standard is a poor indicator of thermal performance with these bags especially at temperatures below -6°C / 20°F. Please refer to our Good Night’s Sleep Guarantee rating for a more accurate temperature guide.

  • Plasma™ 10D outer shell is incredibly light and exceptionally breathable
  • 274g of 90-10 Russian Goose Down with a minimum fill power of 800
  • Alpine fit with EXL® system improves loft and maximises 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
  • Plasma™ 10D inner throughout
  • Supplied with waterproof roll-top stuff-sack and storage cube

General

  • Form: Mummy
  • Color: Ombre Blue

Size

  • Recommended Body Length: 200 cm
  • Width (Shoulder): 75 cm
  • Width (Foot): 50 cm

Temperature Range

  • Comfort: 2°C
  • Limit: -3°C
  • Extreme/Survival: -20°C

Weight / Pack size

  • Weight: 580 g
  • Pack size (L x Ø): 26 x 20 cm

Filling

  • Weight: 287 g
  • Type: Daunen
  • Material: Goose down
  • CuIn: 800 cuin

Material

  • Outer shell: PLASMA™ - 10D Nylon
  • Inner liner: PLASMA™ - 10D Nylon



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