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 (you may want to size down for bases).