The Annapurna Down Jacket from Mountain Equipment is one of their continuously bestselling jackets for those off to this planets extremely cold environments. This is because of its box wall baffle construction throughout the jacket reducing cold spots, & the harder wearing synthetic filled shoulders resist compression damage from pack straps. Its outer is made from Drylite Loft. This totally windproof & highly water resistant Nylon fabric is hard wearing & light enough to allow the Down 675 to fully loft. The hood is fully adjustable allowing you to gain a comfortable customised fit yet it is big enough to pop over a helmet, & can be removed when not in use. The hood & back of the jacket contain Mountain Equipments proprietory ELX system, which is mainly used on their sleeping bags. The ELX system is simply elasticated stitching that reduces the amount of dead space in the jacket allowing your body to do less work to stay warm. The Annapurna Jacket is a choice jacket for those who want total functionality in the most severe environments. M.E. only uses Down Codex Audited Animal Welfare approved sources for all their Down filled products marked with the Down Codex Stamp. DRILITE Loft outer; totally windproof & highly water resistant 420g (Size L) of 90/10 Pure Down with a fill power of 675 Box wall baffle construction throughout POLARLOFT wadding on the shoulders to resist compression Fully adjustable zip-off helmet compatible hood 2-way YKK® moulded centre front zipper with updated rear GEMINI baffle EXL system incorporated into hood & back of jacket Internal stretch mesh water bottle holder & drinks tube retainer For all you kit geeks out there, the links below will take you to Mountain Equipments Information pages where they will explain this jackets different fabrics, fills & constructions techniques in greater detail. Drilite Loft 675 Down Polarloft Box wall baffle construction (explained in sleeping bag terms but it has the same implications) ELX system (mainly used in their sleeping bags but they have cleverly featured it in the hood of this jacket) Most people are scared to wash their down jackets but like all equipment it does need to be maintained. It is actually really easy! Feel free to give the shop a call from 09:00 until 17:30 Monday to Saturday (19:30 on a Wednesday), as we are always happy to help & give friendly advice. Or if you are reading this outside our normal opening hours here is a useful link to Trekitts