A sweatshirt with a shark mouth on it is a gag shirt or a fun, graphic sweatshirt. The sweatshirt can be found at Green Hill Clothing Company or at other hip retailers online.
The sweatshirts are typically one color such as black, gray or white though some companies may make them in bolder colors such as red, pink, green or yellow. MouthMan Hoodies makes bold colored shark mouth hoodies. These hoodies are made for younger children and have shark or dinosaur half mouths placed on the elbows and arms so that when the elbows come together, the child can make a mouth. These are fun for children's fashion as they can play with the sweatshirt wherever they go.