Geotextiles are created through the process of needling, weaving or heat bonding polymer materials. There are a range of geotextiles from nonwovens through to high strength wovens, and each provides the same basic functions but have different features. All geotextiles provide filtration and separation, however, the nonwovens will also provide protection to another geosynthetic or a surface, while the wovens will provide reinforcement to the subgrade. In deciding on the material, it is important to consider your polymer. Polypropylene is a stronger material and also more chemically resistant against hazardous materials, while polyester has a high resistance to temperatures.