What is a "ten-gallon hat"?

A ten-gallon hat is a type of cowboy hat that is popular in the American West. Contrary to its name, it doesn't actually hold ten gallons of liquid but is named for its wide brim and tall crown, which provide ample shade from the sun. It's typically made of felt, leather, or straw, with a creased crown and a flat brim that's often turned up at the sides. The hat is associated with cowboy culture and has been a popular symbol of the American West since the late 1800s. Today, the ten-gallon hat is still worn by cowboys and rodeo performers, as well as being used as a fashion accessory.