Definitely smudge proof.
I just received my brow pen. Super easy to use. The color was a great match. As far as the wear of the pen. I was able to wipe off the mistake I made quite easily with just water. So I don’t know how water proof it is. I will test and report back in a few days.  But it is smudge proof. Once it drys it doesn’t smudge which is awesome.
Rating: 4 stars