This innovative design features deep-pocketed dual-layers that contain litter box messes from spreading throughout the house. Excess litter falls through the large holes on the top layer and is trapped by the soft surface underneath. The bottom layer is made of a plastic, waterproof film that repels urine and odors. The two layers are attached on both sides so you can easily pour the trapped litter back into the litter box. You can also rinse off the mat to clean liquid messes. The Fresh Kitty™ Grate Litter Mat is soft on your kitty’s paws as it steps out of the litter box.