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Eyes are the window to the soul, which explains our centuries-old passion for lining and defining them. Eyeliner is an easy way to play around with your look at the drop of a hat: a plain top turns into something far chicer when paired with a dramatic cat-eye, for example. Eyeliner is the little black dress of your makeup collection and that's why the task of finding the perfect one feels so daunting. Here are our prerequisites for a flawless eyeliner: waterproof, smudge-proof, transfer-resistant, long-lasting, and easy to apply, with each attribute varying in importance depending on the person. If you struggle to achieve the perfect wing, L'Oréal Paris's Infallible Flash (and its helpful attached stencil) helps you carve out the perfect line with precision. Similarly, Kaja's Wink Stamp comes with a dual-sided stamp pen that dedicates each side to ensure an even left and right wing. Stila's Stay All Day liquid formula has been lauded by reviewers for years thanks to its impressive staying power, ideal for long, busy days in which the available time for reapplying is zilch.