The Redline Sleeping Bag is Mountain Equipment's warmest for the coldest expeditions. Its 850 fill goose down insulation is the loftiest down available, and the Drilite Loft shell protects the down with highly water resistant protection. Drilite Loft is exceptionally light and highly breathable to ensure a good night's rest in temperatures as low as 58F. Apart from being the warmest and loftiest, the Redline's high quality performance comes from Mountain Equipment's unique baffling process. Its V and trapezoid 2 1 baffle construction keeps the down in place for ideal heat retention, and the trapezium 6 footbox works with the DC8 hood to ensure exceptional warmth. Mountain Equipment's Expedition Fit gives this mummy bag extra space for your mountaineering outfit. The EXL top lining improves thermal efficiency and comfort.