Ideal for permanent landscape areas, flower beds, shrubs and trees to control weeds. Allows water, air and nutrients to pass freely to soil while blocking sunlight. Will last for years in direct sunlight, but more appealing under 2 In. to 3 In. of bark mulch. Made of ultra violet-treated Pointbond Polypropylene. 15-year product is 1.5 Oz. per square yard. Designed to control weeds before they start, this environmentally safe fabric offers a reliable barrier against unwanted plant growth.