3M's cleanroom mats are multi-layered mats with a pressure-sensitive adhesive backing. They are recommended for use in areas where cleanliness and hygiene are of paramount importance. Its sticky surface easily removes dirt from shoe soles and wheeled trolleys. When the top layer is soiled, it can be removed with a simple movement. The mat can be laid down on a clean, level floor. Its low profile also allows it to be laid under doors.