The three layers that make up the Memory Foam bathroom mat sets—a fabric layer, a middle layer of sponge, and a bottom layer of anti-skid material—are incredibly comfortable and long-lasting for frequent use. The toilet lid cover shields your toilet lid from scuffs and damage, and the two floor mats insulate you from the chilly bathroom floor. The bottom is non-slip and is composed of premium PVC. Because of the mat's non-skid backing, it stays put and won't move about, making you safer and cozier. Please remember to only place carpets on dry, smooth surfaces.