American Excelsior Company is the inventor of biodegradable erosion control blankets. Developed in the early 60’s,Curlex® excelsior blankets are specifically designed to actually promote ideal growing conditions for grass seed, while simultaneously protecting top soil from wind and water erosion. Curlex® excelsior blankets have long passed the test of time. By design,Curlex® blankets have a built-in swell factor-wet curled excelsior fibers sightly expand in thickness and interlock to form a strong, fiber matrix.This allows the fibers to provide intimate contact with local terrain. Water flow is trained to follow the curled fiber matrix.The roughness of the curled excelsior matrix slows the velocity to a point where gravity takes over,which allows moisture to slowly seep into the topsoil to promote ideal growing conditions.