Papal camauros are of red wool or velvet with white ermine trim and are worn, usually in winter, in place of the zucchetto, which in turn takes the place of the biretta worn by other members of the clergy. Like the biretta worn by lower clergy and the mortarboard worn by academics, the camauro derives from the academic cap (the pileus), originally worn to protect tonsured clerical heads from the cold. It is often worn with a shoulder winter cloak (mozzetta), also sometimes fur-lined.