This K&N Pro Baseball Flat visor cap has a matching fabric sweatband and undervizor. It is made from material consisting of 83% acrylic, 15% wool and 2% spandex. Small/medium sized caps fit a 6 3/4 to 7 1/4 hat size and large/xl sized caps fit a 7 1/8 to 7 5/8 hat size.