Reduce the fatigue of upright work by using the NoTrax Diamond Sof-Tred Rug - Black. At 0.5 inches thick, this rug is made of PVC closed-cell foam and designed to reduce fatigue. All four sides of the mat are beveled to prevent trip hazards. The textured face of the mat contributes to its superior tensile strength and tear-resistance. Available in a variety of sizes, this rug is intended for commercial use.