Happy Feet is a heavy-duty anti-fatigue mat that features a dense foam cushion encapsulated in nitrile rubber, making it suitable for both wet and dry environments. 1/2'' dense foam cushion and nitrile rubber surface provide excellent anti-fatigue qualities. Certified high-traction by the National Floor Safety Institute (NFSI). Nitrile rubber surface is penetration proof; borders will not crack or curl. Welding safe; grease/oil proof; chemical resistant; ESD rating of electrically conductive.