This is a commemorative T-shirt given to extras during the filming of Naoki Urasawa's 20th Century Boys movie. It has been opened once, but I believe it is unused and still in the original bag it came in. (I apologize, as my memory is a bit hazy due to the time that has passed since I obtained it.) The size is M (unisex). Please understand that there may be some age-related deterioration due to the time that has passed since I obtained it.