One major use of a vehicle mat is to keep the car looking clean. Most mats can be easily removed for cleaning and then replaced. Some require fixation points to ensure they remain fixed in position. Mats are generally considered unnecessary in vehicles that are permanently fitted with rubber carpets - such as commercial vehicles (trucks, vans) and some off-road and agricultural vehicles. Vehicle mats are an interior car part accessory that dealerships generally include with the purchase of a vehicle. However, with the surge in leasing organizations and sales through such channels, some cars are offered without them.