The GI Joe Yo Joe! 30 Single T-Shirt illustrates how the All American Heroes communicate to each other. Sure, 'Yo Joe' may be used as a means of greeting or attentiveness but it can also serve as a Morse Code kind of function by a series of rapid fire 'Yo Joes'. How else do you think that talk to each other while in the heat of combat against COBRA? The GI Joe Yo Joe! 30 Single T-Shirt is made from 100% cotton, distressed to give it that well loved look, the earlier mentioned phrase, and since the t-shirt is 30 single it means the quality is a cut above the rest!