bathtub mat non slip only attaches to smooth clean surfaces instead of textured surfaces. The non slip shower mat features 200 powerful suction cups, ensuring that it sticks firmly and stays in place. How to make it stick firmly? Soak the bath mat for tub in warm water for 10 minutes to avoid curl, then moisten the tub with a little bit of water, then press on each suction cup to make sure the bathtub mat sticks firmly to the tub. Extra large non slip bathtub mat 40 x 16 inches will cover the length of most tubs. The bathtub mat consists of 176 drain holes, draining water out quickly and keeping the shower mat non slip, dry and clean. Made of PVC material. Easy to clean. Just throw the bathtub mat in the washing machine and let it air dry afterward.