Fabric Weed Mat Gives Superior Weed Control Chemical-free weed control mat allows air, water and nutrients to pass through Strong; holds up to sharp or abrasive rocks Brown color blends well with bark mulch Easily cut with scissors to fit Weed Barrier Pro is a super-tough, 3-1/2 oz. polypropylene fabric weed mat, strong and specially designed for use beneath bark mulch, crushed stone, gravel, or paving stones. Similarity in color to bark mulch results in less obvious bare spots too. Suppresses weed growth while allowing air, water, and nutrients to pass through. Can also be used behind retaining walls.