EyekoEyeko Skinny Liquid Eyeliner Bogo

BUY at Birchbox

This London-based brand's liquid liner lets you create mod looks in a flash. Rather than frustrating us with a hard-to-control brush tip, it features a pen-style applicator that's completely goofproof, allowing you to determine the thickness of the line you create and vary the intensity of your look. Plus, the fadeproof formula will hold up all day and night. And so you can always have defined eyes, this set comes with two for the price of one.