The NoTrax Rubber Brush Outdoor Rug - Black collects the dirt from shoes before they enter the lobby. At 0.625 inches thick, this rug is made of SBR rubber to remain flexible while withstanding extreme temperatures. It features thousands of tough, flexible, rubber fingers that sweep shoes clean. The molded and beveled edges create a retention dam to trap dirt and moisture. It is a recommended and approved product as part of the GreenTRAX program for "Green Cleaning" environments. Available in a variety of sizes, this rug is intended for commercial use.