Okay, so the 100% cotton Star Trek City on the Edge 30 Single T-Shirt is really cool. Just look at it! Yeah, now that we are on the same page the Star Trek City on the Edge 30 Single T-Shirt is a quality t-shirt made out of a super soft cotton and based on episode of Star Trek called 'The City on the Edge of Forever'. If you are not familiar with the episode, McCoy goes all crazy and goes back in time to prevent somebody's death. However time-space doesn't care for that much and Kirk and Spock need to undo what McCoy has wrought. I wonder if they run into Dr. Who? Either way, the Star Trek City on the Edge 30 Single T-Shirt is a great retro style t-shirt for you Trekkies out there!