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. LARGE SIZE: This shower tub mat measures 36" x 17" MATERIALS: Made of 100% PVC foam. 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. 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.