Montana MOA Gerry Davis Umpire Shirt. Powder blue shirt with black MLB collar. MOA logo embroidered on the left chest. The Gerry Davis Signature Series Umpire Shirt, tested on-field by some of the world's best professional umpires, is the choice for the beginning umpire or the seasoned veteran alike. This Major League Baseball version features black, white and powder blue trim. You won't find a tougher shirt on the diamond. Gerry Davis Signature Series combines quality, performance and lightweight construction to give you one of the best offering in the officiating marketplace. Try it once -- wear it for a lifetime -- the only shirt as focused and tenacious as the umpire who wears it!