Hair density is simply how many hairs are added to your hair system base.
* Light-Medium Density is 70% to 90%
* Medium Density is 100% to 120%
* 130% and up (This is thick)
Below are examples of various hair densities (in no particular order):
150% Density140% Density
160% Density120% Density 100% Density
200% Density130% Density