Cardinals wear hats called zucchettos, which originated in the 13th century and served a practical purpose: to keep their heads warm in cold, drafty churches since they had a portion of their heads shaved in a tonsure. The zucchetto is a small skullcap that fits closely on the head and was originally meant to protect the shaved part from cold. Although the tonsure practice has largely faded, the use of the zucchetto remains as a traditional part of ecclesiastical attire, symbolizing their office. This tradition developed because clergy had their heads partially shaved as a sign of religious devotion, and the cope (a cape-like vestment) they wore lost its hood over time, leaving them exposed to cold. The zucchetto offered a practical solution without breaking church rules against wearing hats inside. Today, the zucchetto is a mark of rank in the Catholic Church, with cardinals wearing red ones to symbolize their willingness to shed blood for the Church, while the Pope wears white ones and bishops wear amaranth-colored ones.