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Mountain Equipment Firefly

Mountain Equipment Firefly
Purchase Mountain Equipment Firefly

  • Mountain Equipment Firefly

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The Mountain Equipment FireFly is the lightest bag in the Extreme Light Range. The very best 900 fill power down and the lightest construction methods combine to give high quality/lightweight bag for mountain use. The Firefly is the perfect sleeping buddy for the ultra weight concious and is ideal for nights in the high mountains during the late Spring and Summer.

The Plasma outer is amazingly lightweight, breathable and tear resistant. Its the lightest downproof fabric around keeping the Russian Goose Down securely in place. The bag has an Alpine fit that is slightly more tapered in the upper body/leg areas so it minimises weight and enhances thermal performance.

The FireFly features weight saving slanted box-wall baffle construction throughout the main body. Ground level seams on the bag means that the top sheet wraps right over your body, increasing insulation. The foot of the bag uses a four baffle trapezium shape to keep weight and bulk to a minimum whilst restricting down migration. Throughout the top half of the bag the lining utilises EXL elasticated stitching on the baffles to hug the bag close to your body, increasing thermal efficiency, loft and comfort. The hood is constructed of seven baffles to provide excellent insulation. The neck baffle on this range is significantly lighter than other models to save on that all important weight, yet it still remains thermally efficient.

Mountain Equipment Firefly Features

  • 90-10 900 FP Russian Goose Down insulation
  • 10D Plasma outer
  • 10D Plasma lining throughout
  • Alpine fit 2.0 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 YKK#5 Coil 2-way zip baffle
  • Waterproof roll-top stuff-sack and storage cube
  • Good Nights Sleep Guaranteed -3°C

Size Guide

Size EN
Max User
Fill Fill
Reg 4°C -2°C -18°C 190cm 75cm 50cm 185cm 90-10 900 Goose Down 252g 550g 21 x 18 x 16cm
XL 4°C -2°C -18°C 205cm 75cm 50cm 200cm 90-10 800+ Goose Down 287g 580g 26 x 20 x 16cm

Please note Extreme temperatures are at the point of danger to health. With extremely light and air permeable fabrics, the EN13537 test standard is a poor indicator of thermal performance with these bags especially at temperature below -6°C. Please refer to the Good Night's Sleep Guarantee rating for a more accurate temperature guide.


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