Anyone who has stood on a hard concrete floor for longer than a few minutes will tell you how hard the surface can be on your feet, knees, and back. Reduce the fatigue and soreness with the Buffalo Tools Interlocking Rubber Mat 4 Piece Set. These four 19.7 by 19.7 inch flexible rubber mats interlock on all sides, so you can link multiple sets together to create a custom shape for your space. This mat's 5/8 inch (16mm) thick perforated rubber provides enough cushion to reduce fatigue without creating a tripping hazard, and the non-slip surface gives you more traction when grease and other liquids get spilled. Just spray it clean with a hose or power washer when it gets dirty.