1.Hundreds Of Suction Cups: shower mat feature 164 strong suction cups that help hold in place on smooth, clean surfaces, won't slip on the bath or shower floor. its also heavier and thicker than other mats. great for home, spa, gym bath and shower. 2.Larger Size And Features Holes: Our extra large and generously sized mat is 21 x 21 inch and provides excellent coverage. Our mat features small holes throughout to allow water to circulate. 3.Prevent Falls: secure suction cups before each use. plastic bath mat will only attach to clean, smooth surface. not for use on textured, tiled, or non-smooth surfaces. do not use bath oils and jump on the bath mat may cause slipping. 4.Machine Washable: the shower mat tub is machine washable for hassle-free maintenance. simply wash it with machine wash cold, and air dry. we recommend rinsing and drying your bath mat periodically to remove oily and slippery buildup that may occur over time.