Camauro

Pope Benedict XVI sporting a rare appearance of a camauro, December 2005.
A head view of the body of John XXIII, with a camauro just visible
Pope John XXIII, the last pope to commonly wear a camauro, was buried wearing one.

A camauro (from the Latin camelaucum and from the Greek kamelauchion, meaning "camel-skin hat") is a cap traditionally worn by the pope, the head of the Catholic Church.

Papal camauros are made from red wool or velvet with white ermine trim, and are usually worn during the winter in place of the zucchetto. 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 in the cold season. It is often worn with a red mozzetta.