Tony Stark Light-Up Arc Reactor LED Iron Man 1 Black T Shirt--Size L Black cotton t-shirt containing a light-up Arc Reactor. Powered by a battery pack cleverly hidden within an inside shirt pocket.Requires 4 AAA batteries (not included).With fresh batteries in the battery box, Arc Reactor will glow when switched on. Machine washable (all electrical components can be removed from the shirt). Note: Design by Teelight, a particular and conspicuous Iron Man Mask Logo on the back of Tshirt. Look for this brand against counterfeiting! Please see the size chart as picture shown. Size L fits 5.5 ft~5.7 ft.