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Mexican boxer Saul “Canelo” Alvarez is only 21 and already has a record of 39-0-1 with 29 knockouts. Set to box Shane Mosley in Vegas on May 5th, this breakout fighter has just signed with Under Armour. This is a big move for the brand, which also sponsors athletes such as Michael Phelps, Cam Newton, Jose Reyes, Buster Posey, Brandon Jennings and Georges St-Pierre. Alvarez will also be debuting a custom UA boxing boot in the fight with Mosley. Stay tuned to Nice Kicks for additional images of these custom boots.