A wig cap is a thin layer worn under a wig. It can flatten natural hair, protect the scalp, keep loose strands contained, or help the wig sit smoothly.
Types
Nylon caps are common and flatten well. Mesh caps breathe better. Cotton or bamboo caps feel softer on sensitive scalps. Wig grips add hold.
Do you need one?
Not always. Some people prefer wearing wigs without caps because caps can slip or feel hot.
Bottom line
A wig cap is optional support. Use it when it improves comfort, smoothness, or security.