Hog Heaven anti-fatigue mats are designed to provide comfort and durability in a variety of harsh conditions. High-density nitrile-blended cushion helps eliminate pressure to the lower back and legs, providing superior comfort. Certified high-traction by the National Floor Safety Institute (NFSI). Sloped edges provide a safe transition from floor to mat. Nitrile-blended cushion provides years of useful service life; cushion is molded, not glued, to the nitrile rubber surface so it will not separate; edges will not crack or curl. Welding safe; ESD rating of electrically conductive; chemical resistant; surface is grease/oil proof and cushion is grease/oil resistant. Available in 5/8'' or 7/8'' thicknesses with solid black or with OSHA-approved caution yellow borders on two sides.