This has been my favorite eyeliner since high school. It’s waterproof, smudge proof, and also lasts all day! I have monolids, so it’s hard to find an actual eyeliner that is waterproof, and with good staying power. Without this eyeliner my liner would not be the same. The only con about this eyeliner is that you can’t get all the product out once you reach the bottom, and also it gets kinda messy. Other then that if want a super waterproof liner that will not come off till you take it off. This is the one!