The pet cooling vest will keep your dog cool in higher temperatures. Simply immerse the vest in cold water for a minute, until it is saturated and gently wring out the excess water. Fit the vest onto your dog and the "kelvinator effect" of the moisture evaporating from the vest ensures that your dog's temperature will be lowered. As the vest slowly dries, simply re-soak it, to reactivate the cooling properties. The vest is antibacterial and machine washable on a cool setting and should be air dried naturally not tumble dried or placed on a radiator or direct heat source. Available in medium size.