Bi-level surface effectively scrapes dirt and moisture from shoes, trapping it beneath shoe level to prevent tracking. Reinforced rubber nubs prevent pile from crushing and extend the performance life of the mat. Fade and stain-resistant solution-dyed PET fabric (14 oz./yard2) is resistant to staining, dries quickly, and will not fade or rot. Low-profile borders help reduce potential tripping hazards; certified high-traction by the National Floor Safety Institute (NFSI). Mats feature Anchor Safe Backing made with heavy 100 mil nitrile rubber that keeps mats in place.