The specially-designed 2-layer mat helps trap the kitty litter from your cat's paws so it isn't tracked throughout your home. The litter falls through the honeycomb-shaped holes and stays between the layers until you pour it out. The bottom layer is waterproof to protect your floors. Wash with water. Simply place the mat under, or in front of, your litter box (not incl.). Plastic. 23"L x 14 1/2"W.