Personalized Nuclear Ornaments Circle Infant Romper. A green tree with radioactive symbols instead of ornaments in a colorful circle is a unique gift design for college students, physicists, environmentalists, nuclear engineers and workers at birthdays and holidays. 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)