Engineered with warmth and flattering lines, the Tirill Jacket from Kari Traa is one of our favorite winter jackets for everything from cross-country skiing to hiking in the foothills. Kari Traa uses a comfortable, stitchless ultra-sonic quilt technique to provide a strategic body-mapped design—with water-resistant treatment on the hood and shoulders, stretch panels, under the arms, and light insulation on the front and back—to keep us warm, protected, and moving freely throughout our day.