Warning: YINENN shower mat only attach to smooth and clean surface. Do not install over grout lines, voids, textured, uneven tiled or non-smooth surfaces. Do not use bath oils in case of slipping. Make sure that your mat is securely attached before entering or exiting your tub, shower or other slippery areas. Also it's recommend to allow the mat to air out in a well ventilated area for 24 hours before use if you encounter a strong odor when the package is first opened. Machine washable and durable: YINENN bath mat consists of 149 drain holes, machine washable to facilitate hassle-free maintenance. To clean at any time, simply toss the mat into the machine and enjoy its fresh appearance. Air dry for years of safe, healthy, hassle-free to use. Multifunctional and utility: looks like pebble design, provide massage experience in shower time as it comes with 164 suction cups, featuring necessary anti-slip function, meanwhile YINENN shower mat is 21 inch x 21 inch which provides excellent coverage and also features small holes throughout to allow water to circulate. Large square bath mats: No chemical smell, vinyl quality material. Heavy duty and square shape fits standard shower stalls. Generously sized shower mat 21 W x 21 L. Non-slip shower mats with hundreds of suction cups: YINENN anti-slip square bath mats features 169 strong suction cups that help hold in place on smooth surfaces. Powerful suction cups offer 360 degree safety protection for users. Heavier and thicker than other mats. YINENN shower mat is a great choice for the home, gym, spa and more!.