Bi-level surface effectively scrapes dirt and moisture from shoes, trapping it beneath shoe level to prevent tracking; water dam border holds moisutre keeping it of your floors, can hold up to 1.5 gallons of water pre square yard. Reinforced rubber nubs prevent pile from crushing and extend the performance life of the mat. Solution-dyed PET fabric is resistant to staining, dries quickly, and will not fade or rot. Eco-Friendly SBR rubber backing contains 20% post-consumer recycled rubber from car tires; PET surface is made from 97% recycled contant reclaimed from plastic. Weight: 24 oz./yard2. Construction: Needle-punched. Overall mat thickness: 3/8".