Size: 18”x30” & 20”x39” 10mm thick with beveled edges; Material: ECO PVC Foam Resilient Foam Reduces Fatigue when Standing; Non-Slip Back Supportive Foam Layer Conforms to the Contours of Your Feet Care instructions: Clean with brush, broom, vacuum or shake briskly; occasionally rinse with a garden hose or wipe with damp cloth and air dry.