This Helly Hansen Men's Sirdal Insulated Vest is a 'must-have' piece for any outdoor enthusiast – perfect for layering with your favorite shell or wearing as a stand-alone performance layer. With recycled ECOLoft Air SR Insulation the Sirdal insulated vest has an optimal warmth to weight ratio. Its light relaxed-fit enhances 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.