BALTIMORE, April 22 /PRNewswire-FirstCall/ -- Under Armour(NYSE: UA), the leader in performance apparel, footwear and accessories, today announced an unprecedented partnership with Cal Ripken, Jr. and Ripken Baseball. Among the terms of this comprehensive 5-year agreement, the Ripken Baseball complex in Aberdeen, Md. will serve as the official home of Under Armour Baseball and the Aberdeen IronBirds will become the first professional baseball team to be outfitted in Under Armour uniforms.