Montana MOA Cliff Keen Navy Umpire Shirt. MOA logo embroidered on the left chest. The Cliff Keen 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. Features a navy shirt with red and white trim. You won't find a tougher shirt on the diamond. The Cliff Keen umpire shirt 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!