Shark Attack. Complete your ocean inspired look with this super scary Shark Hat! The shark lovers in your life will go wild for this too cute novelty hat. This silly hat is a perfect accessory for aquarium trips, shark themed birthday celebrations, and Halloween fun! One hat per package. One size fits most, approximately 24 around the inside of the hat. Made of polyester. Create an animal adventure birthday for the animal lover in your life with fun costume accessories, gifts, and favors. Stock up on zoo and animal party supplies to make your wild life party one to remember!