Laura Mercier Caviar Intense Ink Waterproof Liquid Eyeliner
"Despite my admitted laziness on pretty much every other element in my beauty routine, not a day goes by that I don't layer on the liquid eyeliner. That means I've tried my share of formulas, and I'll admit: theLaura Mercier Caviar Intense Ink Waterproof Liquid Eyeliner ($28) is one of the best. Not only does the inky pigment go on darker-than-dark, it also will not budge all day — no matter how sweaty you get." –KC