AmazonBasics Foam Kitchen/Office Comfort Standing Mat - 20x36-Inches Black kitchen mat for enhanced comfort when standing Made with 3/8-inch thick layer of vinyl foam Ribbed top layer for traction; trip-free edges; non-slip base Conforms to the contours of your feet Measures 20x36 inches (WxL) Mat is tightly rolled up upon delivery; Please allow one week of regular use for mat to flatten completely