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 inch short all way around.