Our Tanksters/Muscle Tanks are perfect for Boys or Girls! With wider straps, it gives more coverage to go under rompers, jerseys, sun dresses, overalls, and more. The Tankster/Muscle Tank is sporty and feels just like your favorite workout tanks! It is made out of breathable material which aids in keeping your baby's perfect little body just the right temperature. It also has moisture wicking properties to keep your baby's skin so snuggly soft!