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. 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 eclectically conductive; chemical resistant; surface is grease/oil proof and cushion is grease/oil resistant. 5/8" or 7/8" thicknesses with solid black or with OSHA approved caution yellow borders on two sides.