The festival is derived from medieval propitiatory rituals meant to appease the townspeople and create a joyous atmosphere to bring in the new year.
The population of Foiano is subdivided into four cantieri (districts): the oldest are the "Azzurri" (azures) and the "Rustici" (rustics), that were created in 1933, and "Bombolo" (plump), which was born in 1934; the youngest cantiere are the "Nottambuli" (night owls), formed in 1961.
Initially, the floats were town carriages and carri matti where lupine, chestnuts and salt cod would be thrown out to the crowd as a treat.
The Cantiere that made the most voted float wins the "Coppa del Carnevale" (Carnival Cup).
An effigy of Giocondo, King of the Carnival is made from straw and rags, and is burned in the main square as a form of collective purification for the people of Foiano.