Bryce Harper
In 2018, several Major League Baseball players including Mike Trout and Bryce Harper began wearing the C-flap, an attachment to the earflap covering the jaw, invented by Markwort. The C-flap has caught on quickly throughout Major League Baseball and now batting helmet manufacturers such as Rawlings and Easton have begun producing helmets with a built-in earflap extension emulating the C-flap.