The 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 fabric stay put on sloped areas. Colored stripes located 12" apart make for easy planting.