Why Buy Under Armour Short Sleeve Shirts? Why wouldn't you? It's Under Armour. This is the brand that changed sports and fitness as we know it. The performance technology they've developed and engineered into their gear is a literal game-changer. Wicking? They started the whole thing. It doesn't matter if you're up at dawn running laps or if you're in an office all day. Under Armour has you covered from underwear to socks to shirts.
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