Scraper mats are placed outside doorways to act as a primary defense against larger particles of dirt and water entering the premises. This type of mat is generally constructed with edges that rub against the shoe sole. A looped vinyl system or open-holed system then allows the debris to fall into the mat. Most of the dirt is then hidden from view, keeping the mat appearing clean for longer than a mat with no holes or loops. Scraper mats are used in conjunction with interior mats that wipe off smaller dirt particles and water.
As a "finishing" mat, interior mats are placed inside the doorway to absorb the remaining water and dust particles from the shoe sole. Interior mats can be rubber-backed or vinyl-backed. The rubber backing allows the mat to stick to the floor, reducing the chance of slips and falls. A vinyl backing is more prone to curling and slipping. The surface of the mat is made of an absorbent material. This can be carpet or an artificial substance such as polypropylene. A carpet mat can be plush and soft to walk on. A polypropylene surface can be designed in a "waffle" pattern, that rubs against the sole to remove extra dirt. Both types of surface material have good absorption properties. Polypropylene mats may also have a "dam border" that prevents water from leaking out of the sides of the mat.
Some exterior entrance mats are made of coir, a natural substance created by bundling coconut fibers together. The coir scratches off dirt and water from shoes and is resistant to saltwater. The intrinsic properties of the coconut fiber mean that water is not easily absorbed so that dried mud does not stick to the fibers. The mat can be easily cleaned by shaking off the mud particles.
Logo mats serve the same purpose as regular mats but have the added advantage of personalizing the entrance so customers can recognize the business from outside. The logo also acts as a free advertisement for the company.