This popular baseball Trucker cap is made of Polyester, giving it a lightweight and comfortable feel. With a pre-curved bill, it provides optimal shading but you can still curve it to your liking! The back part of the cap is made of breathable mesh, for better ventilation and keep you dry, snug and free from stuffiness when you are sporting.Boasting a convenient, adjustable button closure on the back, you can easily custom fit the cap on your head and ensure a secure fit and maximum comfort at all times.