The EzyDog DFD X2 Boost is the second generation of our original dog life jacket, the DFD. This new design offers the same amount of flotation, with a more streamlined ergonomic fit. We know never to compromise when it comes to the water safety of our pets, so we use only the highest grades of materials in all our dog life jackets. Whether you're teaching your dog to swim or simply using it as a safety precaution, the DFD X2 Boost will help your dog stay safe around water. Features a streamline, ergonomic fit - Aside from offering more buoyancy, also tapers to the dog much more effectively. It is extremely buoyant - flotation is distributed much more evenly, with foam also passing under the dog's belly. The revolutionary top pull collar adjustment is a fixed collar that still allows maximum adjustment and buoyancy to the dog's neck and head.