Personalized Nuts, Bolts, Angles and Gray Steel Beams Infant Romper. A pattern of steel I-beams, channels, angles and nuts and bolts is a unique gift design for construction workers, structural and civil engineers and steel detailers and drafters at birthdays, holidays and graduation. 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)