![Randy Marsh, left, director of umpiring for Major League Baseball, jokes with umpire Mike Muchlinski as he wears a cooling vest in the umpires dressing room prior to a baseball game between Randy Marsh, left, director of umpiring for Major League Baseball, jokes with umpire Mike Muchlinski as he wears a cooling vest in the umpires dressing room prior to a baseball game between](https://l450v.alamy.com/450v/2n9h9a9/randy-marsh-left-director-of-umpiring-for-major-league-baseball-jokes-with-umpire-mike-muchlinski-as-he-wears-a-cooling-vest-in-the-umpires-dressing-room-prior-to-a-baseball-game-between-the-cincinnati-reds-and-the-pittsburgh-pirates-thursday-june-7-2012-in-cincinnati-new-technology-allows-umpires-to-wear-cold-packs-under-their-shirts-an-innovation-that-umpires-say-makes-it-feel-20-degrees-cooler-ap-photoal-behrman-2n9h9a9.jpg)
Randy Marsh, left, director of umpiring for Major League Baseball, jokes with umpire Mike Muchlinski as he wears a cooling vest in the umpires dressing room prior to a baseball game between
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