Personalized Heart Belongs To Gym Infant Romper. My heart belongs to gym text with the word GYM wearing sneakers is a funny school design to brighten the day of teachers, students, athletes and fitness gurus. 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)