It's about 3/16 thick, or about 5mm. It sticks well, and the pattern is random so you can patch together pieces of scrap if you cut it carefully. I was able to do my whole trailer with one standard order, 50$ or so. You can get lots of colors. It's neoprene but it holds up better than you think. I spill gas on one part all the time and it has not come off or melted or discolored. No black shit tracked in the boat either.
It's soft, if you cut a bevel with a razor it gives it a nice finished look. Check out the website.