Personalized Mars Space Travel Science Infant Romper. Space exploration travel quote says going to Mars is not science fiction it's just science on this astronaut or explorer Infant Romper - Black 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)