3N2 Umpire Polo Shirt - Men's The 3N2 Umpire Polo is a must-have behind the plate. It includes modern side vents to allow for airflow, helping to evaporate sweat and reduce discomfort. This classic top includes a three-button placket, a left chest pocket, and ribbing on the collar and sleeve ends. The extended tail helps the shirt remain tucked in while kneeling behind the plate. 100% polyester with an anti-microbial finish. Imported.