Biodegradable Double Net Straw-Coconut Blanket 8 ft. by 112 ft. Covers 900 sq. ft 2:1 Slopes 100% biodegradable erosion blanket made of 70% straw and 30% coconut fiber. Degradable netting provides erosion protection for up to 24 months. Designed to be used on gradual to steep slopes and are available for both short term biodegradable applications and long-term soil stabilization.