Dalen WS20100 3-Foot by 100-Foot 20-year Weedshield Landscape Fabric The ultimate porous landscape fabric for permanent applications Rated #1 for stopping weeds by 8 university studies Patented dual-layer material with a 20-year weed-free guarantee Allows water and nutrients in, keeps weeds out Pliable, easy-to-use fabric conserves soil moisture