This particular liner is interesting in that it's gel liner in the form of a mechanical eye pencil. Because the formula is a gel formula, the eyeliner stays put quite well throughout the day. When you first apply the eyeliner, you have a minute or two where you can smoke it out if you'd like. After that, the liner sets and will become quite smudge proof.
While I had this liner on, I remember accidentally rubbing my eyes at one point, but when I checked the mirror, nothing has smudged. I had this liner on for about ten hours today, and there was definitely no smudging. However, there was a tiny bit of transfer to my lower lash line that I noticed. Overall though, the transfer wasn't very noticeable at all, and I hope this helped you!