A hair gloss that coats and sits on top of your hair. It is a transparent, semi-permanent shine service that can be done at the salon or at home. It works to fill the hair, closing the cuticle, creating a smooth surface that light bounces off of for immense shine. A gloss can last you 3 to 4 weeks. While gloss treatments aren’t an alternative to color, they do help enhance and refresh your current color, bring out subtleties and can be a good introduction to hair color for someone with virgin hair.