I find the highlighters to not smear any ink once once the pen ink is fully dried, unlike some other highlighters that seem to have a solvent quality about them that will smear many inks even after drying, so kudos to Sharpie for the virtually smear-proof properties of these highlighters.

Also like all the other Sharpie products these highlighters are smear proof

Works great and smudge proof

Great assortment of colors, nice narrow tips, and seriously smudge proof- even on slick coated paper.

For the most part these are smear proof, but if you have a tendency to really press down hard on the paper then that will cause the marker to smear, but even then it's not that bad