Made of 100% cotton, the Green Lantern Movie Power Readings T-Shirt gives a display of some current power ring energy levels. You see, Green Lantern rings can only hold so much of a charge before one needs to recite the oath on a power battery. They aren't as gimmicky as a Yellow Lantern ring, which requires one to fight a Green Lantern or cause some terror! Guess if a Blue Lantern was around they could recharge the Greens all of the time but they weren't in the movie, as far as I know. Where was I? Oh yes, Green Lantern Movie Power Readings T-Shirts. You really should get it because we know you're a Green Lantern fan, and it is always good to keep track of how much juice those rings have left. Don't want to be out in the cold darkness of space and run out of gas. That wouldn't be fun at all.