Shell : 20D nylon waterproof. Lining : 100% polyester pongee. Filling : 1500g duck down. 1500g model : total weight 2.2kg, suit temperature -10 °C -5°C. L zipper + R zipper : can connect to be a double sleeping bag! Or, you can choose to get a replacement. Our goal is to ensure a happy shopping experience with us.