Density standard: Medium=100%

 Extra light: 40%, Light: 60%, Medium light: 80%, Medium: 100%, Medium heavy: 120%, Heavy: 140%

 If standard 100%= medium you can use %.

Otherwise it also possible  just to use: Extra light. Extra light to light. Light. Light to medium light. Medium light. Medium light to Medium.  Medium ( and so on).  Or for example light + 10% ( = light to medium light) Medium light + 10% (= medium light to medium).

With too thick hair it doesn't look natural. And it's impossible to make a natural parting. It will be too tight - a real wig look.

Light to medium should be more than enough for most men.   And medium to med heavy for women.

If you are a little bit wiser (older) don't go for too much hair. And choose a lighter color. And let it be possible to see your scalp a little bit.