The Apieu Born to be Madproof Eye Pencil is waterproof, sweatproof, and oil-resistant, allowing it to maintain long-lasting wear in various environments. You can use it during intense exercise, in hot weather, or on oily skin without worrying about smudging or fading. The pencil core is soft and smooth, making it easy to apply. It effortlessly creates fine lines and can be blended for a smudged or smoky effect. Whether you prefer a natural look or a bold, dramatic eye makeup, this pencil can meet your needs.