7/8″ thick hog heaven anti fatigue mats static dissipative, anti fatigue mat is made of 20% recycled material and is welding safe for use in a variety of environments. Anti fatigue safety mat is made of static dissipative 100% nitrile rubber with 20% recycled nitrile material. Ergonomic mat offers an electrical rating of 107 ohms. Anti fatigue mat is grease and oil proof, as well as, welding safe. Ergonomic mat features a textured surface for slip resistance. Closed cell pvc/nitrile cushion offers outstanding support and is permanently molded to the nitrile rubber top. Anti fatigue safety mat provides a minimum coefficient friction rating of 0.86. Rubber borders will not curl or crack. Anti fatigue mat is easy-to-clean using a pressure washer or hose. Nfsi certified.