E! illustration/Courtesy of Naked SundaysSun protection isn't just important during the summer months-and no one knows that better than Khloe Kardashian herself. Her favorite illuminating drops from the sun care beauty brand Naked Sundays are currently on sale for 50% off. As part of the brand's early Black Friday sale, this Kardashian-approved glowing serum with SPF 50 is just $15. Bring back a sun-kissed glow to your face with Naked Sunday's CabanaGlow. It's extremely versatile, perfect to use under makeup, blended into your foundation, or as a bronzer, highlighter, or blush.