A cloth diaper (American English) or a cloth nappy or real nappy or a reusable nappy (Australian English and British English) is a reusable diaper made from natural fibers, man-made materials, or a combination of both. They are often made from industrial cotton which may be bleached white or left the fiber’s natural color. Other natural fiber cloth materials include wool, bamboo, and unbleached hemp. Man-made materials such as an internal absorbent layer of microfiber toweling or an external waterproof layer of polyurethane laminate (PUL) may be used. Polyester fabrics microfleece or suedecloth are often used inside cloth diapers as a "stay-dry" wicking liner because of the non-absorbent properties of those synthetic fibers. Modern cloth diapers come in a host of shapes, including preformed cloth diapers, all-in-one diapers with waterproof exteriors, fitted diaper with covers and pocket or "stuffable" diapers, which consist of a water-resistant outer shell sewn with an opening for insertion of absorbent material inserts. History Traditionally, cloth diapers consisted of a folded square or rectangle of linen cloth, cotton flannel, or stockinette, which was fastened with safety pins. Today, this type of diaper is referred to as a flat. The flat was commonly used in the late 1800s in Europe and North America. In the early part of the 20th century, cloth users were boiling diapers as they became aware of bacteria. During World War II, the increase of working mothers brought the need for the "diaper service". Fresh cotton diapers would be delivered on an as-needed basis. In 1946, a Westport, Connecticut homemaker named Marion Donovan, invented the "Boater", a waterproof covering for cloth diapers. Marion was granted 4 patents for her designs, including the use of plastic snaps that replaced the traditional and dangerous "safety pins". In 1950, the prefold diaper was invented by a diaper service owner and produced by Curity. The prefold diaper consisted of a standard "flat" diaper, but pre-folded and sewn together. Also in 1950, the Safe-T Di-Dee diaper was invented. The diaper was preformed and was the first pinless, snap-on diaper- this was the first fitted diaper. It was invented by Sybil Geeslin (Kennedy) who subsequently sold the patent. They were then sold as Keystone Safe-T Di-Dee Diapers and were nationally distributed. In the 1960s, the disposable diaper rapidly took hold and cloth diaper use fell out of favor. In the late 1980s, cloth diaper users re-emerged with environmental issues