Featuring Manucurist Poppy Red. Red nails aren't necessarily a trend per se, and that’s because it's considered a classic no matter the season. “Red is back before it ever really left,” says Glass. However, Glass says her clients have been “loving” the shade as of more recently. It was just a few months ago that the “red nail theory,” the idea that wearing red nail polish attracts more romantic attention, went viral on TikTok. Whether you believe the theory or not, red nails are never a bad idea for summer.