Byrdie: Paris’s Coolest Instagram Girl Reveals Her Effortless Makeup Essentials

"This is the eyeliner to end all eyeliners for three simple reasons. First, the brush tip—it's flexible but not too flexible, and it makes tracing a precise flick or thick cat eye a breeze. Second, the formula is inky black and rarely requires retracing. And finally, the longevity: I've worn this eyeliner through rain and sleet and I've even fallen asleep with it on (oops), and it does not budge. As someone with naturally oily lids, these three things have secured it in my heart as my holy grain liner." Faith Xue, Byrdie editorial director