The name is self - explanatory, it absorbs sweat. The sweatband is considered the most important part in a baseball cap. A good sweatband makes the cap comfortable to wear. Sweatbands have 3 components - Fabric + Foam + Non-woven tape. Picture shown is Cotton Sheeting 6060.
The foam inside is usually 2mm thick. For the inner side of the sweatband, we usually use Non-woven material. Upon request, PVC can also be used.