Not all brushes are made equal. A Wave brush, as the name suggests, is designed only for wavy and curly hair. It usually contains natural bristles made of pork. Pork brushes are softer than the standard brush but firm.
A wig cap is the base material of a wig and impersonates the state of the head — like the development of a baseball cap. Wig caps are the establishment of wigs, and the hair and style are connected to the cap.