the netting material may also include various additives as known in the art to improve resistance to ultraviolet uv radiation or to impart a particular color by way of example only a small amount of carbon black additive about 0 1 to about 2 5 by weight may be incorporated into a suitable polymer to impart both a black color and a significant amount of uv resistance into the netting material although not shown in fig1 the bottom sheet 160 or netting of the erosion control blanket 100 in accordance with the present invention is substantially similar in construction to the top sheet 120 as shown and described that is the bottom sheet 160 will also have an open meshed material with a high degree of open area and be made of very similar materials to that of the top sheet 120 still referring to fig1 u2013 3 in another embodiment of the present invention the top sheet 120 and the bottom sheet 160 may be constructed of polymer materials having slightly different mechanical properties for example as the top sheet 120 will be exposed to more direct sunlight and uv radiation than the bottom sheet it may be desirable to use a top sheet 120 which is stronger and heavier than the bottom sheet 160 in one preferred embodiment the top sheet 120 is formed of 600 denier high tensile polypropylene material and.