From summer climbing in the alpine to winter ski sessions in the backcountry, we always take the Patagonia Down Sweater Vest wherever we roam. We stow the vest inside its chest pocket before we pack it up, but let it out regularly so its plush 800-fill Traceable Down insulation retains its loft and efficient insulating properties over time. In classic eco-friendly fashion, Patagonia's Traceable Down comes from geese that were never live plucked or force fed.