Even when water turns to ice, the Firefly will effectively protect you from the cold. Designed by Mountain Equipment, this ultralight sleeping bag accompanies you in the mountains from late spring to the end of the summer season. The 10D Plasma™ outer shell is incredibly light and exceptionally breathable 90-10 goose down fill with an 800 fill power Alpine fit with EXL® system enhances coverage and maximizes thermal efficiency Slanted box-wall baffles Ground-level side seams Anatomical hood 4-baffle anatomically shaped footbox with offset footbox Full-length Gemini™ zip baffle Plasma™ 10D inner throughout Comes with waterproof roll-top stuff sack and storage cube Comfort temperature: 2°C Limit temperature: -3°C Extreme temperature: -20°C Firefly - Regular: Inside length: 190 cm Width: 75 cm Foot width: 50 cm Maximum user height: 185 cm Packed dimensions: 25 x 19 x 16 cm Fill weight: 274 g Weight: 560 g Firefly - Long: Inside length: 205 cm Width: 75 cm Foot width: 50 cm Maximum user height: 200 cm Packed dimensions: 26 x 20 x 16 cm Fill weight: 287 g Weight: 600 g Mountain Equipment Firefly - Sleeping bag