SlipX Solutions Blue Square Shower Stall Mat Provides Reliable Slip-Resistance (21" Sides, 160+ Suction Cups, Great Drainage) Made of High-quality Vinyl. Measures 21"W x 21"L. Great drainage designed specifically for your shower. Provides reliable slip protection using plentiful suction cups. Easy to clean - simply hang and air dry after each use. Machine washable. For use on non-textured surfaces. Not for use on refinished surfaces.