Durable and stylish, structured caps have an inner lining that allows the crown of the hat to maintain its shape, even when the wearer removes it. Many professional athletes, such as baseball players, wear these hats on the field as they ensure that the imprinted logo is always prominently displayed. Structured caps come in many different colors and materials, including extra-soft brushed cotton, airy mesh and even lightweight chino. For a more relaxed look, there are also similar-looking unstructured caps with soft crowns and no rigid lining.