The Lightline down Jacket from Mountain Equipment is designed to meet the demands of the modern mountaineers. Weighing 740g with 296g of 675 fill power duck down, the Lightline has great warmth to weight ratio, it has an enhanced fit & a fully adjustable, removable hood that offers excellent protection in minus temperatures. The use of down ensures the best warmth to weight ratio & compressibility of any other forms of insulation. Its outer is made from Drylite Loft. This totally windproof & highly water resistant Nylon fabric is hard wearing & light enough to allow the down to fully loft. Therefore making it perfect for dry cold conditions when resting at belay points or whenever youre outside in the cold not doing much moving about. 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 296g (size L) of 90/10 Pure Down with a fill power of 675 Stitched-through construction throughout Adjustable zip-off hood with 3 panels for exceptional fit & protection 2-way YKK moulded centre front zip with rear insulated baffle 2 zipped hand warmer pockets behind insulated flaps Inner zipped security pocket Adjustable cuffs & hem drawcords 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 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 recommended product for washing & caring for down. Nikwax Down Wash I hope this helps.