Geogrids form a distinct category of geosynthetics designed for reinforcement. Geogrids are either integrally manufactured, ultrasonically or adhesive bonded or joined in knitting or weaving process and then coated. Although geogrids are used primarily for reinforcement, some products are designed for asphalt overlay and water proofing or for separation and stabilization. Geogrids also are used as gabions and sheet anchors, inserted between geotextiles and geomembranes, or used to construct mattresses for fills or embankments over soft soils.