Our solar glow in the dark tshirt is an interactive tshirt that you can draw on with light! A great space t-shirt for budding astronauts The illuminated tshirt is printed with a special ink that not only glows in the dark giving off an eerie glow, but can also be directly drawn onto with a small penlight. The afterglow of the drawing remains on the tshirt for up to five minutes and then gradually disappears, ready to be drawn on again. You can have endless fun creating illuminous shapes, lines and letters. A perfect glow in the dark tshirt for camping, festivals or parties. The graphic is cool for day or night. Everyone loves the interactive element of this t-shirt.