The construction of the XKG Down Transition Jacket exemplifies the performance qualities of the XKG Series and sets a new standard for lightweight and packable layering. Built with 145 grams of 800 fill waterproof down, this jacket has the best warmth to weight ratio of anything in the XKG line-up. This jacket easily fits over any mid-layer piece and can be worn under any of our shell pieces for when conditions are at their toughest.