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Under Armour Women's Fly by Tank ($25)

If we had to describe this racerback tank top in just a few words, we'd go with breathable, lightweight, and ultra-soft. It's made of moisture-wicking fabric and creates a flattering silhouette that's not too tight or too loose. "Very lightweight, LOVE the back that is semi-open," one reviewer wrote. "Very breathable. It looks amazing on."