Personalized Fitness Fanatic Workout Exercise Infant Romper. Fitness fanatic Infant Romper - Heather outfit for anyone who enjoys a trip to the gym for a serious bit of exercise and a good time working out. 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)