Black Convertible Umpire Jacket . Black Convertible Umpire Jacket. Rip-stop poly outer shell, front chest pocket, 1/2 zip front pullover. This pullover offers a water resistant ad moisture wicking material for all weather conditions. Features extra tuck-in length. Sleeves zip off at the elbow to convert to short sleeve jacket for the ever changing weather conditions. Sized for your chest protector (size down for bases).