Smitty Short Sleeve Umpire Shirt - Men's The Smitty Umpire Shirt is a major league design, complete with a three-button front and chest pocket. It's made of ComfortTECH polyester that combines anti-wrinkle properties with moisture-wicking technology to keep you looking and feeling at the top of your game. The split-tail bottom hem is extended for extra length that easily tucks in and stays in, no matter how many times you're crouching behind the plate. 100% polyester. Imported.