The Lumin provides maximum insulation with minimum weight & bulk; it's a great companion for those lightning fast ascents on frigid
...Warm & lightweight down leg insulation suitable for moderate to high altitude mountaineering. With 200g (size L) of 90/10, 600+ fill power down & a windproof/water-resistant Drilite Loft outer, & boasting an active, articulated cut, the Lightline Pant will keep you climbing in comfort. There are reinforcements on the seat, knees & inner cuffs, with full length moulded zippers, semi-elasticated waist, removable braces, fly zipper with insulated storm flap, & one external thigh pocket.