The Helium Range from Mountain Equipment is unashamedly aimed at walkers, cycle-tourers and trekkers looking for high levels of performance with a reduction in weight and the Helium 800 is at the top of the tree in this range. The Helium™ 20 fabric is exceptionally light but strong and durable. As with all Mountain Equipment down sleeping bags the Helium 800 comes with an anatomically designed hood and foot-box and these along with the slanted box-wall baffles are packed with 90/10 Pure Duck Down with a 700+ fill power. So if you are serious about your trekking and touring and head out in colder conditions the Mountain Equipment Helium 800 would be a great choice. Mountain Equipment Helium 800 Features: Helium™ 20 Outer Shell 766g of 90 - 10 Pure Duck Down with 700+ Fill Power Alpine Fit 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” -16C Total Weight 1260g Regular Length