Mighty Junior Microfiber Ball Penguin. Mighty MicroFiber toys are durable, plush dog toys constructed with multiple layers of fabric, and covered with a soft, MicroFiber material your dog is sure to love. The seams are located on the inside of the toy and sewn multiple times to increase the toy strength. The toy also has durable squeaky balls inside the body of the toy along with minimal stuffing. Mighty toys float in water and are machine washable (air dry).