These are a life - or should I say legs, feet and back - saver! My work floors are tile over concrete and there is nothing forgiving about that. My feet would be killing me after standing for hours working. But I didn’t want black mats because I worried they would stain the tile over time. These came in a stone (tan) color so I decided to give them a try and I couldn’t be happier. They are 4’ long which works well with my 6’ long tables and they are heavy, well packaged and immediately laid flat when I unrolled them. Time will tell how they hold up but I am very pleased so far.