NWOT The Source Jacket is an insulated puffy specifically made for the whitetail hunter. But unlike traditional compressible jackets, this piece is both durable and silent. It is ready to shrug off brambles on the way to your stand, and it won't swish when you draw back on your target buck. The Source Jacket functions as an outer layer jacket in the first half of the season and transitions to an insulating mid-layer worn under our windproof outerwear as temperatures drop.