Get ready to celebrate St. Patrick's Day in style with the Chicago White Sox New Era Kelly Green Halfway To St. Patrick's Day 59FIFTY Fitted Hat. Made with 100% polyester, this high crown, structured fit hat features a flat bill and green undervisor for a unique look. Show off your Irish pride with the raised embroidery and represent the Southside with this must-have for fans and Southside Irish. Officially licensed and imported from New Era.