Doortex, Anti-Fatigue Bubble Mat, Black, 36" x 48" (FR490120FBM) Anti-fatigue cushioned bubble mat  ergonomically designed to reduce back, leg and feet strain when standing for long periods Closed-top bubble design provides additional cushioning for high levels of support and comfort Ramped edges reduce the risk of tripping Easy to wipe clean; ideal for office, home and industrial use 48" x 36"; black rubber; mat size may vary slightly due to manufacturing process; other size options are available