My Teacher is a rock Starr shirts are available in white with navy print or navy with white print. All of the youth shirts, as well as the adult navy shirts, are 4.3 oz.-100% combed ring spun cotton. Both of the black and white adult sizes are 4.3 oz.-50/50 combed ring spun cotton/polyester. The combed ring spun cotton makes for a softer, lighter and more comfortable feel.