Stila Cosmetics' Stay All Day Eyeliner is the stuff of beauty legend. Among the members of the choir singing the liner's praises are our own editors and even you, our readers, who gave it a 2020 Allure Readers' Choice Award. It's the product we use for our Zoom meeting cat-eyes, it's the product we cry in (through the tears, it goes absolutely nowhere), and it's the eyeliner pen we reach for on the days we're trying to cheer ourselves up with a graphic liner look to wear with our now-perfunctory face masks.