Personalized Dad's Gym Buddy Childs Workout Youth T-Shirt. Daddy's gym buddy Youth T-Shirt - White workout apparel for kids who accompany Dad when he goes to the gym or does a work out at home. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.