About 25 years ago, I was doing some work at a building that was about to be knocked down. When i was leaving, I noticed what looked liked a 4 ft x 6 ft door mat in front of the entrance. Being it was going to be thrown into the dump truck with the rest of the building, I took it. Boy it sure makes working on the ground alot nicer. It has the rubber backing on it, so after I'm done I can shake it off, and roll it up.,,