Alliance Gator NGF5W-0410000 4' x 100' Gator GF5 Woven Fabric - Gator GF5 is a woven geotextile made from polypropylene yarns, forming a stable and durable network so that the yarns retain their relative position. It provides separation for good subgrades by preventing mixing of subgrade soils. A woven geotextile can achieve higher tensile strength at low elongation, known as high modulus. It is inert to biological degradation and resistant to naturally occurring chemicals such as alkali and acid.