A mattress is a large, usually rectangular pad for supporting a lying person. It is designed to be used as a bed, or on a bed frame as part of a bed. Mattresses may consist of a quilted or similarly fastened case, usually of heavy cloth, containing materials such as hair, straw, cotton, foam rubber, or a framework of metal springs. Mattresses may also be filled with air or water. Mattresses are usually placed on top of a bed base which may be solid, as in the case of a platform bed, or elastic, such as an upholstered wood and wire box spring or a slatted foundation. Popular in Europe, a divan incorporates both mattress and foundation in a single upholstered, footed unit. Divans have at least one innerspring layer as well as cushioning materials. They may be supplied with a secondary mattress or a removable "topper". Mattresses may also be filled with air or water, or a variety of natural fibers, such as in futons. Kapok is a common mattress material in Southeast Asia, and coir in South Asia. History The word mattress derives from the Arabic مَطْرَحٌ (maṭraḥ) which means "something thrown down" or "place where something is thrown down" and hence "mat, cushion". During the Crusades, Europeans adopted the Middle Eastern method of sleeping on cushions on the floor, and the word materas eventually descended into Middle English through the Romance languages. The oldest known mattress dates to around 77,000 years ago and it's from South Africa. Early mattresses contained a variety of natural materials including straw, feathers or horsehair. In the first half of the 20th century, a typical mattress sold in North America had an innerspring core and cotton batting or fiberfill. Modern mattresses usually contain either an inner spring core or materials such as latex, viscoelastic or other flexible polyurethane foams. Other fill components include insulator pads over the coils that prevent the bed's upholstery layers from cupping down into the innerspring, as well as polyester fiberfill in the bed's top upholstery layers. In 1899 James Marshall introduced the first individually wrapped pocketed spring coil mattress now commonly known as Marshall coils. In North America, the typical mattress sold today is an innerspring; however, there is increasing interest in all-foam beds and hybrid beds, which include both an innerspring and high-end foams such as viscoelastic or latex in the comfort layers. In Europe, polyurethane