Panties (in the USA an Canada) or knickers (in the UK and Commonwealth) are a form of underwear, usually light and snug-fitting, designed to be worn by women or girls in the area directly below the waist. Typical components include a waistband (often elastic), a crotch to cover the genital area (usually lined with absorbent material such as cotton), and a pair of leg openings (also often elastic). They have either no legs or in some cases very short ones. The term is usually used in the plural -- a single unit is a "pair of panties" -- though "panty" is used in such derivatives as "panty liner".