LARGE SIZE: This shower tub mat comes in two sizes. 36" x 17" & 40" x 17". BATHTUB MAT WITH SUCTION CUPS: This shower mat is extra soft and feels very comfortable under your feet. This non-slip bathtub mat is equipped with suction cups for extra safety. CARE: To keep your bath tub mat clean, please surface wash only. NOT MACHINE WASHABLE. INSTRUCTIONS: Rinse mat and clean tub before use. Wet base of tub. Place mat in position with suction cups face down. Carefully step into tub to make sure mat is secure. Carefully step into tub to make sure mat is secure. Surface wash mat and clean tub regularly.