Latex side anchors rugs on solid floors. Smoothes out uneven tiled or slate surfaces. Dense polypropylene side is for use on carpeted floors. Protects rugs from heel punctures and the stress of heavy traffic. Recommended for all types of rugs, especially those crafted by hand. Extend the life of your fine, handmade rugs with a Reversible Nonslip Area Rug Grip. The dual-sided design works on both solid-surface flooring and carpet, providing a measure of safety as it holds your rugs in place.. . . . .