The Felt Store Watering Mat: Black, 12" x 36", 2 Pack 100% non-woven polyester fibers 12 Inches (304.8mm) long x 36 inches (914.4mm) wide x 13/64 inches (5mm) thick saves water and reduces the need for frequent watering locks moisture and releases it when soil is dry recommended for small to medium sized planters and pots