Categories of "Napa" leather for furniture?

Question:I need an explanation about different categories of "napa" leather. I am going to purchase leather furniture and got all kind of brainwashing from salesmen. I can't find useful information on interent. To be specific, I need info about napa 2000, 3000, 4000 and higher. Thanks for help.

Answers:
Napa is a term that is used to describe leatherized sheepskins. Napa leather is also called smooth or semi-aniline leather. This type of leather is first dyed in a vat of aniline and is then colored with a light pigment that evens out the color and increases the durability of the leather.