Sure-Grip pad is the best solution to protect your rug investment. Perfectly engineered for use on hard floors, as well as on top of wall-to wall carpet, Sure-Grip is combined of High density fiber pad and natural rubber. The felt side is lightly singed , so it grips your rug and holds it in place. For rug on top of carpet, just flip it rubber side up for best results. We recommend to trim your pad about 1.5 inches short all the way around, or we can custom cut it (for free!) to suit your specific rug size - just ask us!