A structural twin wall geotextile used in ArborSystem tree pits selected to fulfil stringent structural loading requirements. GLTWGNA twin-wall geonet is used over the top of the RootSpace or StrataCell soil cell system, beneath the surface layer works to eliminate ingress of surface layer works materials into tree pit rooting zone and to provide additional support and stabilisation for surface subbase materials. It also discourages root growth vertically.