I Am Optimus Prime! Transfrom into the steel harden leader of the Autobots, with your very own Optimus Prime costume t-shirt. This Optimus Prime adult t-shirt features the simulated costume torso of the 18 wheeler Autobot. It's perfect for Halloween, costume parties or geeking it up, Transforers style. This red, standard fit shirt is made of 100% cotton. Be sure to check out our Size Chart to get an idea of the average size and dimensions of this Optimus Prime Costume tshirt style. Check back often for some of our new Transformers clothing and other Transformers merchandise at great prices only at AnimationShops.com.