Celebrate every home run and high-five in true Oakland Athletics spirit in the New Era Athletics 5950 Evergreen Side Patch Fitted Hat. Featuring a classic fitted design, this hat uses cotton and polyester to keep your head cool throughout the game. Take the game to the rival fans with fresh athletic style in the New Era Athletics 5950 Evergreen Side Patch Fitted Hat. Crown, Visor, and Button: 100% polyester; Undervisor: 100% cotton.