GroGreen GEO 04NW 0312T 3" x 120' GGS 4.0N Non-Woven Geotextile Fabric - GGS 4.0N is a needle-punched nonwoven geotextile made of 100% polypropylene staple fibers, which are formed into a random network for dimensional stability. GGS 4.0N resists ultraviolet deterioration, rotting, biological degradation, naturally encountered basics and acids. Polypropylene is stable within a pH range of 2 to 13.