Closed-cell nitrile-blended rubber foam will not absorb liquids, and the 100% nitrile rubber surface easily wipes clean with soap and water. Welding safe, chemical resistant, surface is grease/oil proof, cushion is grease/oil resistant. Made in the USA. Certified high-traction by the National Floor Safety Institute (NFSI). Built-in handle enables easy transportation and storage. ESD rating of electrically conductive.