The diamond pattern with black rubber border aggressively scrapes shoes clean. Certified Green Product. 100% PET post-consumer recycled fiber reclaimed from drink bottles. Bi-level pattern captures dirt, sand and moisture below the surface. Exclusive rubber reinforced face nubs prevent pile from crushing in high-traffic areas, maintaining high performance and extending the life of the product. Certified Slip-Resistant by the National Floor Safety Institute. Noise-reducting durable rubber border allows for easy, quiet transition of carts and luggage.