Our Best — Sunbelt Woven Ground Cover consists of 5 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 inches to aid in plant alignment and is UV-stabilized to last even in direct sunlight.