I use a piece of heavy black rubber matting, cut to fit the bench top at about 2.5 x 6 feet. It was cut from one of those inexpensive rubber hallway runners (mats) you can buy at Lowes or Home Depot for maybe $15-20. It is turned upside down to provide a more uniform surface. The bottom surface (now on top) is not perfectly smooth, but has a relatively minor "pebbly" texture. For me it has worked out great.