With recycled ECOLoft™ Air SR Insulation, the Sirdal jacket has a high-performance warmth-to-weight ratio. Its lightness and relaxed-fit enhance your ability to move in nature in changeable conditions. The smart synthetic insulation also avoids clumping when wet, unlike traditional down fill. The outer fabric is ripstop and built to last. It has a PFC-free water repellent treatment – another win for you and the environment.