AquaShield Fall Day Boot Tray, 15 by 36-Inch, Charcoal Unique ridged construction and raised rubber border effectively remove and trap dirt and moisture Molded design will not crush or breakdown over time or use Anti-Static, 100-percent premium polypropylene fiber face will not mildew, mold or rot Made with commercial grade SBR rubber backing Waterguard mats are certified slip resistant by the national floor safety institute