The lightline down jacket from mountain equipment is a best seller for good reason lightweight and highly technical it provides warmth in the most freezing conditions in the worldpacked with 9010 pure duck down to deliver a fill power of 675 the lightline jacket also boasts a drilite loft outer which is completely windproof and highly water resistant with an array features for added expedition functionality such as an adjustable 3 panel zip off hood and inner zipped security pocket the l