Nintendo Mario Bro: RedBaseball Cap Mario Hat Red, OneSize This is a baseball hat from the classic video game series, Mario Brothers! This hat is a replica red baseball cap for the character, Mario! The hat is about 23-inches around. It can be adjusted slightly larger or smaller with a tab in the back. Its a great item to wear everyday, or complete a costume! Dimension & Measurement: One size fits most, Approx 23-inches, adjustable