Propink Complete Nonwoven Fabric is a spun bound polypropylene material. It provides the insulation retention membrane for the Propink Complete Blown-In Wall System. Propink Complete Nonwoven Fabric resists tearing and allows air but not glass fibers to pass through during the installation process. Because It's translucent, framing members are clearly visible for easy application. It also allows for a convenient visual check when installing Propink Complete Loose fill Insulation.