Fibflex Geo Textile 250 GMS is a Polyester Non-Woven Geotextiles are made-up of polyester fibers. The fibers are needed to form a network that retains dimensional stability relative to each other. Fibflex Geo Textile 250 GMS is resistant to chemicals and micro-organism normally found in soils. They are stable with in a PH range 2 to 13 and resistant to short-term exposure to ultraviolet radiation.