24 oz polypropylene fiber in a sculptured surface mat that actively scrapes dirt and moisture from any foot trafic. Cleated rubber backing makes this matting stay in place. A raised rubber border keeps moisture in the mat and not on the floor. UV resistant fabric for indoor/outdoor placements. Green friendly rubber backing has 15-20% recycled content. Resists curling and cracking. Certified slip-resistant by the National Floor Safety Institute.