Having tried several eyeliners, I found the ILIA Thru Line Waterproof Eyeliner stands out for its impressive waterproof and smudge-resistant qualities. The eyeliner glides on smoothly to create precise lines that last throughout the day without fading or smearing, even in humid or wet conditions. Its formulation feels lightweight and comfortable on the eyelids, which is especially important for those with sensitive skin. What I appreciate most is how this eyeliner maintains intensity without requiring frequent touch-ups, making it perfect for long days or special events. The waterproof aspect means it holds up during unexpected rain or tears, so you can rely on it for a flawless look that stays put. Additionally, the product’s resistance to water does not compromise its easy removal with a gentle makeup remover, preventing any harsh rubbing. From a personal experience perspective, ILIA's commitment to clean beauty and quality ingredients reassures me that I’m using a product that cares for both my skin and the environment. If you are looking for a reliable waterproof eyeliner that delivers both performance and comfort, this one is definitely worth trying.