Panties (in American English, also called pants, undies or knickers in British English) are a form of underwear primarily worn by women. Panties can be form-fitting or loose. Typical components include an elastic waistband, a crotch panel to cover the genitalia (usually lined with absorbent material such as cotton), and a pair of leg openings that, like the waistband, are often made of elastic. Various materials are used, but are usually chosen to be breathable.