Signal to everyone that you are a scuba diver with these dive flag muscle shirts from Divers Direct! Recognized all over the world, the scuba diver down flag, or dive flag, is used on the water as a warning to keep boaters at a safe distance from divers who are underwater. Now you can wear this universal symbol on dry land! Made from 100% pre-shrunk cotton, these muscle t-shirts come in different colors, and sizes that range from small to double extra large.