Personalized Radioactive Tree Circle Infant Romper. A tree made of radioactive symbols with a red and yellow glow in a colorful circle is a humorous Christmas design. Fun holiday gifts for college students, physicists, nuclear engineers and workers. Meet your new favorite outfit! Keep dressing simple with this one piece, lap shoulder t-romper. Super soft and perfect for baby's sensitive skin. 5.5 oz. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40; Heather is 90/10 combed ringspun cotton/polyester)