With an array features for added expedition functionality such as an adjustable 3 panel zip off hood and inner zipped security pocket, the lightline is as good as a down jacket gets.the jacket is constructed with mountain equipment's own drilite loft fabric, which is extremely robust, windproof and highly water resistant. Drilite loft is a nylon fabric with a microporous polyurethane coating, treated with a durable water repellent to help keep you dry and protected during harsh winter conditions featuring two zipped hand warmer pockets and inner security pocket, as well as an adjustable and removable hood, styled in a 3 panel design for a perfect fit and added warmth.drilite loft 40d outer totally windproof and highly water resistant296g size l of pure down with a minimum content of 90 10 700 fill powerdown codexstitched through construction throughoutadjustable zip off hood with 3 panels for exceptional fit and protection2 way ykk moulded centre front zip with rear insulated baffle2 zipped hand warmer pockets behind insulated flapsinner zipped security pocketadjustable cuffs and hem drawcordsweight 740g