Bi-level surface effectively scraped dirt and moisture from shoes trapping it beneath shoe level to prevent tracking. Durable reinforced rubber nubs prevent pile from crushing and extend the performance life of the mat. Fade and stain resistant solution-dyed fabric is resistant to staining, dries quickly, and will not fade or rot. Safe certified high-traction by the National Floor Safety Institute (NFSI). 18" x 18" with a thickness of either 1/4" or 7/16".