Our best - Sunbelt woven ground cover consists of 3.2 oz polypropylene, which resists tearing, puncturing and weed penetration. It is approved for most government weed control applications. Sunbelt is ideal for greenhouses, outdoor displays and as a weed barrier for plantings without topical coverings where a weed-free environment is a must. DeWitt Sunbelt is striped every 12 in. to aid in plant alignment and is UV stabilized to last even in direct sunlight.