Straw bales help prevent erosion because you can roll up the straw into logs, which helps to control the loss of soil on hillsides. You can also use the straw to create blankets which lay in areas where the soil is eroding. As water hits the straw mat, it slows down and less soil is lost. Straw is ideal in areas where the erosion is being caused by water rather than wind. The straw soaks up the water and stops its movement. SoCal Shaker Plates can install this product for you in areas where you need the extra support.