Can somebody please tell me what form of printing this is?

My name is Rudy Arviso and I'm an inspring graphic designer and have a question. I've seen t-shirts that are multi-colored and the design is always wrapped in a square or rectangle shape and its always has this shine to it. It feel as though it's a iron-on or sticker of some sort because to the touch it's thick like. But I'm almost certain it's bigger than 8.5x 11 ( is this the standard size or is there a bigger say 9x12). I know I've seen various hip hop artists have old school artists CD cover replications on thier tee shirts and recently I seen a tee shirt at foot locker that looked like and ad from the 80's of an Air Jordan shoe. :confused: ?