Wisconsin Interscholastic Athletic Assoc [WIAA] Umpire Pulse R-Flex HatWisconsin Interscholastic Athletic Association [WIAA] Umpire Pulse Navy Only. Options of a visor with 4 rows, 6 rows, and 8 rows of stitches make this cap a versatile option for Plate, Base, and Field Umpires. Richardson PULSE with R ACTIVE tech is designed to keep you cool, dry and comfortable on the field, so you can focus on the game. R FLEX sizing offers a fit for Umpires at any level. SHAPE Mid Pro FABRIC Performance Polyester VISOR Precurved