The change to the New Era Diamond Era collection caps is part of a partnership between the Yankees, New Era and the David C. Koch Foundation to help fight cancer, according to the team.
This marks the first time that the Yankees have worn the moisture-wicking gear in a Major League game.
They have sported alternate hats on various occasions in recent years, such as camouflage or alternate colors to honor U.S. military members, and throwback 1912 hats as part of Fenway Park's 100th anniversary last season.
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.