"Hair system" is a general term used to describe any type of wig or hairpiece that is used to conceal the bald or thinning area of a person's scalp. Over the past decade, the terms wig, hairpiece, and toupee have developed a negative stigma due to many companies that provide a poor quality product.

Poor quality hair systems are still abundant, however, there are some hair replacement companies that offer truly natural-looking products. The best hair systems are custom made for each individual in order to perfectly match hair color, texture, style, and fit.

Other commonly used terms (in addition to those mentioned above) include "hair replacement system," and "hair unit".