Alliance Gator NGF44NW-06100 6' x 100' Gator GF4.4 Non-woven Fabric - Gator GF4.4 is a needle punched non-woven geotextile made of polypropylene fibers. It is ideal for drainage, filtration and will allow water flow of 135 gallons per minute per square foot in paver or retaining wall applications. Its filament fibers are used for soil separation and drainage. They combine high durability along with excellent physical and hydraulic properties. It is non-biodegradable.