The density of hair refers to how thick the hair is and what density you order is really based on personal choice. Most women achieve a natural appearance with "light to medium" (80%-100%) or "medium" density; however, your choice will depend on your styling preferences and individual profile.

Density Guide
Light density is 80% thickness of an average head of hair.	Medium density is considered 100% thickness of an average head of hair. (This is the average hair density of a normal head of hair). popular choice	Medium density is considered 115% thickness of average head of hair. (This is the above average hair density of a normal head of hair).Good if you want full head of hair.
Medium to heavy density is considered 130% thickness of an average head of hair. (This is thick.) Good if you want very full hair	Heavy density is 140% thickness of an average head of hair. (This is very thick).	Heavy density is 150% thickness of an average head of hair. (This is very, very thick) Good for Theater show production.