Other fabrics are available upon request: suede, leather, boiled wool, satin, …
The material decides by the customer’s choice, and the caps function and shape.
The different customer has the different preferences for the material of the cap, some brand like suede, and wool bent material (It seems high quality), fake wool (feel like wool, a new era even use it for the cheap caps)
The common material is cotton which is always used for all kinds of caps.
Mesh is always used for customized sports caps, it is breathable and good sweaty.
We can check the material pic on the custom ball hats page.