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 AmeriHome Anti-Fatigue Industrial Interlocking Rubber Floor Mats. Four 3 by 3 ft. flexible Rubber Mats interlock on 2 sides, to create a custom shape for your space that covers up to 36 square feet of space. Perforated rubber 1/2 inch (14mm) thick provides cushion, 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.