* Thickness: Hair can be thin, medium, or thick.
* Density: Hair can be sparse or dense.
* Porosity: Hair can be low-porosity, medium-porosity, or high-porosity.
* Elasticity: Hair can be elastic or inelastic.
* Luster: Hair can be dull or shiny.
* Color: Hair can be any color, from black to white.
* Length: Hair can be short, medium, or long.
* Style: Hair can be styled in a variety of ways, including straight, curly, wavy, braided, or updo.