The Firewall Light is part of Rabs Mountain Light product family. Mountain Light products are at their best when you want to save weight on late spring, summer, and early autumn hikes and treks. For many who have chosen Mountain Light, the jacket has also become a favorite option for casual everyday outdoor use. New! Now this favourite jacket is made of Pertex Shell 3L. The surface fabric is just a tad stronger than before. The hood is simpler than before. Many three layer jackets are a bit on the heavy side, and packable 2.5 layer jackets tend to not be as durable. The Firewall Light combines durable three layer technology with a low weight! The fabric also has a much softer and more supple feel compared to the stiff and clunky three layer shells of yesteryears. The jacket boasts a nice, soft-touch liner fabric, laminated together with the membrane and surface fabric. Although shell apparel is recommended to be used with long sleeve and leg base layers, this product is comfy enough