The Zinus non-slip mattress pad 2 pc set keeps your mattress from moving on metal bed foundations or box springs. Use between your mattress and box spring or platform bed to ensure your mattress stays put. Simply place one pad directly on your foundation then place your dust ruffle/bed skirt over it and add another pad below your mattress for a secure sleep. Works just as well for securing your area rugs, simply cut to size and place underneath. Another comfort innovation from Zinus. Pioneering comfort.