Geotextile Non-Woven Underlay S13NW 4.5 x 100m is a UV stabilized, needle punched, and heat treated nonwoven geotextile produced from 100% polypropylene staple fibers. It acts as separator to prevent the intermixing of the different soil layer types, and as filter to allow the flow of fluids while preventing the passage of soil particles. Applications include road, railway and drainage.