The best landscape fabric money can buy! Eight independent universities have tested our 20-Year Weed-Shield and rated it #1 in weed prevention. A patented multi-layered fabric, it allows air, water and nutrients through to the plant roots while keeping 99.9% of weeds out. Easy to cut and use in permanent landscape beds (install with black side up). Cover with mulch. Comes with an exclusive 20-Year money-back guarantee against weed penetration. Guarantee is through the manufacturer.