CBUA Fitted Wool 6-stitch Umpire Cap. CBUA (Collegiate Baseball Umpires Alliance) embroidery on front. A 2 1/2" visor with 6 rows of stitches offer versatility for Base/Field/Plate umpires. Made of Richardson SURGE fabric with R-ACTIVE tech, we combined the traditional look of wool serge with performance features to help keep you cool, dry, and comfortable while you call the game. Eleven fitted sizes make this cap the perfect choice for baseball purists at any level.