Related: REI Is Selling $60 Running Sunglasses for Just $36 Right Now That Shoppers Say 'Don't Slip' Mid-Run “They work great, look cool, and have unmatched quality,” another reviewer raved.

Dark sunglasses are a necessity, but not just to look cool. "Sunglasses help my eyes adapt quickly to the light when I enter the room," Nan Zhu, former personal guard to film star Jackie Chan said.

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