X-Large. Look Fabulous and Stay Cool. Zentek Cool Pads are glamorous lightweight, water-resistant and help to keep your dog comfortable, whatever the conditions. Our cooling pads are created of four layers of the highest technical smart fabrics (same fabric used in astronauts suits). Airflow recharges the cooling ability drawing the heat out of the dog as they sit on the pad. You can wet the mats, if you are in temperatures over 100F. But it is rarely necessary. The huge advantage, The pad regulates the temperature of their surroundings. Highest quality technical materials. Machine washable. Hang to dry. XLarge 30 X 48 inches.