DuraComfort Anti-Fatigue Mat, Bubbled, 3' x 5' x 1/2", Black, NitrileFormerly called Happy Feet, DuraComfort 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 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 Grip surface for wet