Cleaning the mat is effortless due to the drainage holes built into the mat’s backing. Simply take the mat outside to hose it off, then let it air dry. The Nature Reading Cube is constructed from strong, 11-ply birch veneer panels with 25″ diameter crawl through windows. Surfaces are finished with a tough, scratch-resistant, easy to clean, non-toxic, UV finish. Reading Cube features a .75 inch well on top to safely store books, toys, and other items without worrying about the items falling out of the well.