GroGreen GEO 200W 1254320 12.5" x 432' Woven Geotextile Fabric 200 lbs - This woven geotextile is made of 100% polypropylene fibers which are woven into a stable network such that the yarns retain their relative position. It resists ultraviolet deterioration, rotting, biological degradation, naturally encountered basics and acids. Polypropylene is stable within a pH range of 2 to 13.