That stuff that in my Express is tough as nails but it's also tough on a pair of bare knees if you have to get down on them for any reason.I don't have trim on this old 1988 Evinrude and have to get on my knees to lift it. That liner will eat the hide right off!I like it though! Seems to dampen sounds in the boat fairly well. If you drop something, it's more of a dull thud than a loud metallic sound!