This vest helps your dog beat the heat in style. Just soak the vest in cool water and wring out to activate the cooling. Evaporative cooling exchanges the heat with the coolness of the stored water in the fabric. Re-wet the vest as needed to recharge the cooling action. This package contains one cooling vest to fit dogs measuring between 14 inches and 15 inches long. For best fit, measure your dog from the base of the neck to the base of the tail. Comes in a variety of sizes. Each sold separately. Imported.