Cushion Max anti-fatigue mats feature nitrile-blended foam designed to withstand grease, oil, and chemicals. COMFORTABLE | 5/8" nitrile-blended closed-cell foam provides excellent anti-fatigue properties. Dimensions: 36". Rectangle shape, Made of closed-cell nitrile rubber/PVC-blended foam to withstand grease, oil, and chemicals. Rectangle. SAFE | Certified high-traction by the National Floor Safety Institute (NFSI). Slip-resistant and high-traction properties certified by the National Floor Safety Institute. 0. 63'' thickness provides superior anti-fatigue properties. Help reduce discomfort in your legs, feet, and back by standing on this M + A Matting Cushion Max charcoal PVC nitrile anti-fatigue mat.