Gloss hair, a verb, is the act of applying a glossing agent to hair. This agent, typically a gel or cream, enhances shine and smoothness by coating the hair cuticles. For example, celebrity hairstylist Justine Marjan uses a glossing treatment on Charlize Theron's hair to give it a "glassy, shiny finish".
Glossing hair has gained popularity due to its ability to revitalize dull hair and enhance its natural color. Additionally, it helps repair damage and protect hair from environmental aggressors. Historically, hair glossing can be traced back to ancient Egypt, where women used henna and beeswax to enhance the appearance of their hair.