Fernando Tatis Jr. wears a Lizard Skins arm sleeve with his logo on it. In the pictures from Spring, he hadn’t gotten the logo yet, but BaseballExpress.com has spotty inventory of the Lizard Skins sleeves at $11-$15 and you can also find it at other retailers with a Google search.
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Pink Baseball Arm Sleeve
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Vladimir Guerrero Jr Who's Your Vladdy T-shirt, Show Your Support
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What Pros Wear: The Source for Pro Baseball Gloves, Cleats, Bats