Personalized Biological Engineer Zombie Fight Infant Romper. Biological Engineer I fight zombies in my spare time is a humorous gift design for engineering zombie terminators. What would this world be like without them? 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)