The Women’s Mountain Equipment Helium 400 is one of their lightest weight high performance women’s sleeping bags. The Women’s Helium 400 is incredibly light and versatile being ideal to use for a whole range of lightweight travel, trekking and camping situations particularly during the spring and summer months. The very latest fabric technologies and traditional tried and tested duck down insulation combine to make the Mountain Equipment Helium 400 a very high performance sleeping bag. Mountain Equipment Women’s Helium 400 Features: Helium™ 20 Outer Shell 367g of 90 - 10 Pure Duck Down with 700+ Fill Power Alpine Fit with Zoned EXL Slanted Box-Wall Baffles Throughout Mid-Level Side Seams 5 Baffle Low Anatomically Shaped Hood 4 Baffle Anatomically Shaped Off-Set Foot Box Full Length Gemini ™ Zip Baffle and Neck Collar Waterproof Roll Top Stuff Sack ME “Good Night Sleep” -3C Total Weight 845g Regular Length