A T-shirt (T shirt or tee) is a style of shirt. A T-shirt is button less and collarless, usually with short sleeves and frequently a round neck line. T-shirts are typically made of cotton fibers (sometimes others). T-shirts can be decorated with text and/or pictures, and they are often used to advertise , promoting products, companies, films and websites. T-shirt fashions include many styles for both men and women, and for all age groups, including baby, youth, teen, adult and elderly sizes.