For SMOOTH Bathtub Floors ONLY - NOT for textured surfaces.200 suction cups on the bathtub mat used the Vacuum Theory to make it possible to attach the proper bathtub firmly, the same method is used to store the shower mat after shower: you can adhere it to a smooth floor with some of the suctions effortlessly.This bath mat is made from safe TPE material and odorless.If feels soft against your feet.