Co-Extrusion A cutting-edge premium shield surrounds the inner core of the wall cladding on ALL four sides. There are no toxic adhesives or chemicals used because the shield and core are extruded simultaneously in a mold at a very high temperature. In order to increase strength and durability, the core is made of carefully chosen recycled materials and highly dense recycled hardwood and softwood fibers. Best of all, it is 100% recyclable. It has a longer lifespan than typical uncapped composites, requires less upkeep, and guards against mold and mildew.