Bedding, also known as bedclothes or bed linen, is the materials laid above the mattress of a bed for hygiene, warmth, protection of the mattress, and decorative effect. Bedding is the removable and washable portion of a human sleeping environment. Multiple sets of bedding for each bed are often washed in rotation and/or changed seasonally to improve sleep comfort at varying room temperatures. Most standardized measurements for bedding are rectangular, but there are also some square-shaped sizes, which allows the user to put on bedding without having to consider its lengthwise orientation (e.g. a duvet). In American English, the word bedding generally does not include the mattress, bed frame, or bed base (such as box-spring), while in British English it does. In Australian and New Zealand English, bedding is often called manchester, especially in shops. Manchester was a center of the cotton industry in the late 18th and the 19th century, and into the 20th century, and so cotton goods (principally sheets and towels) were given the name 'Manchester goods', which later was simplified to 'manchester'. A set of bedding generally consists of at least flat or fitted bed sheet that covers the mattress; a flat top sheet; either a blanket, a quilt, or a duvet. Sometimes with a duvet cover is to be used in addition to or instead of – the top sheet; and a number of pillows with pillowcases, also referred to as pillow shams. (See for more info on all these terms.) Additional blankets, etc. may be added to ensure the necessary insulation in cold sleeping areas. A common practice for children and some adults is to decorate a bed with plush stuffed animals, dolls, and other soft toys. These are not included under the designation of bedding, although they may provide additional warmth to the sleeper. Materials Lightweight white, solid-color or printed plain weave, satin weave, or flannel cotton or cotton/polyester blends are the most common types of sheeting, although linen and silk may also be used, including in combination. Goose or duck down and other feathers are frequently used as a warm and lightweight filling in duvets, comforters and quilts. But such fill can protrude in part even from tightly woven fabric, and be an irritant for many people, particularly those with allergies. Natural and synthetic down alternatives are marketed. Cotton, wool or polyester batting is commonly used as fill in quilts and down