Now if you really wanted your ribcage to glow in the dark you would have to roll around in toxic sludge, which would either turn you into a superhero or kill you. Or save yourself the bother and get this wicked glow in the dark t-shirt. Another quality shirt from Rock Chan. Heavyweight, 100% cotton and with a print of a ribcage and vertebrae. The printed image is high-quality, full-colour, glows in the dark, and is printed on both the front and back of the T-Shirt.