On a warm sunny day, dogs will trot for the shade, lie down, and pant the heat away. They need an air-conditioner, or a Ruffwear Swamp Cooler to stay cool, happy and active. Dogs can beat the heat, staying cool while hiking and biking in the desert, playing on the beach, boating on open water under full sun, and waiting for their turn during outdoor agility trials in the heat. Outfit your dog in the Ruffwear Swamp Cooler and let the cooling begin! The Swamp Cooler Vest uses evaporative cooling to keep dogs cool in the heat. By soaking the vest in cold water the natural process of evaporation dissipates the stored heat, chilling the Swamp Cooler and your furry friend.