Non-slip Round Bath Tub & Shower Mat - 23 in Wide (Blue) Measuring a generous 23 inches in diameter, it features over 80 suction cups for reliable slip-protection, and durable vinyl for years of use. Easy to clean - simply hang and air dry after use, or machine wash with your everyday laundry. Essential Round Shower Mat. Machine washable for years of use. Perfect for the shower, providing reliable slip protection on almost any non-textured surface. Adheres to the shower floor with suction cups. Made of high-quality vinyl. 23" diameter. For use on non-textured surfaces.