A kippah, yarmulke, or koppel is a brimless Jewish skullcap, usually made of cloth, traditionally worn by Jewish men to fulfill the customary requirement that the head be covered. It is the most common type of head-covering worn by men in Jewish communities during prayers and by most Orthodox Jewish men at most other times. Among non-Orthodox Jewish individuals, some wear them at most times, while most wear them only during prayer, while attending a synagogue, or at other ceremonies, and others wear them rarely or never.