great easy to use self sharpening eyeliner [SEP] i absolutely love the little sharpener installed inside of the cap that allows the eyeliner to be always on point with a simple twist of the cap the eyeliner is ready to use which is perfect for someone like me who is miserable at attempting to sharpen eyeliners as advertised i have found that this eyeliner is waterproof but whether or not it is smudgeproof is a bit questionable i think that really depends on skin type and for me i have found that the eyeliner lasts really well for a few hours before starting to smudge and transfer onto my lower lashline i think priming my eyelids would help the eyeliner last a lot longer but i am usually able to touch up on it every so often so that it looks on point overall i love the eyeliner and would definitely consider buying again when my current one runs out