I was concerned the runner size pad would slip given the smaller size and weight of a wool runner. So far it has stayed put. I have it in a high traffic hallway where the traditional thin rubber mats have let the carpet slide around. This pad gives a noticeable amount of cushion as well, despite its thinness. The felt side is quite rough, which allows it to grip the underside of the rug, and keep it in place. I have also had this pad in a 9 x 12 size for over a year, and love it.