Best-Step rug pads provide a non-slip, cushioned foundation for your area rugs; helps reduce wrinkles and prevents rugs from slipping allowing easier, more efficient vacuuming. Eco Friendly, Made with plant oil based polymer, Phthlate free formula. Built-in Microban?technology inhibits the growth of stain and odor causing bacteria, mold and mildew even in damp or humid conditions. On an unprotected surface, bacteria can double in number every 20 minutes. Microban?protection works continuously for the lifetime of the product, keeping it cleaner longer.