Built for safety, comfort, and durability, Hog Heaven anti-fatigue mats feature a nitrile rubber surface that is welding safe, grease/oil proof, and chemical resistant. The high-density, closed-cell nitrile-blended cushion helps eliminate pressure to the lower back and legs, providing superior comfort. Hog Heaven mats have an ESD rating of electrically conductive and can be safely used in static-sensitive environments. They are certified high-traction by the National Floor Safety Institute (NFSI) and provide excellent slip resistance, even in wet environments. The nitrile surface is molded, not glued, to the cushion so it will not separate over time. The sloped edges provide a safe transition from the floor to the mat and they will not crack or curl over time.