The Ultimate Blue Shark is here! This shark costume is the perfect ultimate addition to your playtime costume chest! Creativity and inspiration can be endless from deep sea water dives to doo doo doo dooing your way through your favorite baby shark song! This costume includes a ...The Ultimate Blue Shark is here! This shark costume is the perfect ultimate addition to your playtime costume chest! Creativity and inspiration can be endless from deep sea water dives to doo doo doo dooing your way through your favorite baby shark song! This costume includes a tunic with a blue poly-foam head, dorsal fin on the back and a tail fin at the bottom with a poly-knit body. Add your own stuffing to the tail fin for extra definition. Fits most children size 4-6.