Delta Eagle Gen 3. Softshell JacketRE ENGINEERED BASE FABRIC TREATMENT. Traditionally, softshell jackets are made of three basic structural layers: face fabric, membrane, and microfleece. Theyre all glued together which results in a rather thick and heavy jacket. We departed from convention by separating the fleece from the membrane and replacing the adhesive with a layer of air. This very different approach gives you a softshell jacket with improved breathability and extra insulating