The original DeWitt Weed-Barrier 20 Year is the best in the industry for cost-conscious professional and commercial installations. It is also ideal for retail consumers who demand professional quality products. Our DeWitt Weed-Barrier 20 Year is a 4.1 oz., woven polypropylene, needle-punched fabric with reinforced fiber for extra moisture control and helps the fabric stay put on sloped areas. Colored stripes located 12 inches apart make for easy planting.