The NoTrax exclusive Dyna-Shield PVC sponge is manufactured with a tough protective top layer that is one with the sponge mat underlayment Unlike urethane or acrylic top coats that are applied after the mat is produced, Dyna-Shield is manufactured into the mat to provide a long-wearing protection to the sponge anti-fatigue mat Outperforms competitive products in tear resistance and tensile strength - extends service life by as much as 50 percent All four sides are beveled to minimize trip hazards Measures 6-feet length by 2-feet width by 1/2-inches thick