The NoTrax Wayfarer H.D. Outdoor Rug - Gray can be used on concrete or other hard surfaces. At 0.5 inches thick, this rug is made of vinyl using vinyl-looped construction and features an open back for dirt pass-through. 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.