A cold-morning jog loop goes better in a light layer, and the Swix Horizon 2. 0 Vest brings 90/10 duck down warmth without bulk. This lightweight down vest works as a warm midlayer for training or on its own for everyday winter wear. What Our Gearhead(R) Experts Are Saying:"Pulling a loaded sled across a snowy field with the vest under my shell, my arms kept moving freely because the softshell panels flexed with every pull. The down held my core warm the whole way."