Clothing, in the broadest sense, refers to materials that cover the body which provide warmth, shelter, hygiene, and/or modesty. Clothing can be made of any number of materials, including plant fibers (such as cotton), animal hides or fibers (such as wool or fur), and artificial textiles (such as polyester or spandex). The vast variety of clothing speaks to the diversity of human cultures and behavior, with different modes of clothing being reserved for work, certain socioeconomic classes, and children.