Erosion Control Blankets are thick, fibrous blankets woven out of either natural materials (e.g. straw and coconut fiber), synthetic materials (e.g. polypropylene) or a mixture of natural and synthetic materials. These blankets are used primarily to slow water runoff, provide effective sediment and erosion control, and enhance re-vegetation. These blankets are commonly applied to channel and ditch linings, slopes, culvert inlets and outfalls, riverbanks, and levees.