The first layer and second Layer Leather are all Genuine leather,they are mainly processed from animal skin fabrics.
Currently, the most popular genuine leather on the market are divided into the dermis layer of skin (Nappa Leather) first and second layer of skin. First layer is closest to the surface, less disability from the finest raw hide of work, the natural leather surface of the well-preserved state, the coating is thin, can show a pattern of animal skins natural beauty, it is not only for custom bags ,but also has good air permeability, is the presence in the upper dermis.
The second layer of skin is relatively loose fibrous tissue layer part, some people also name it “split leather”, it is by spraying chemicals or covered with PVC, PU film processed, its fastness to wear less, is kind of cheaper leather. the second layer Leather is also flexible but a little harder.
If the bag factory in questions feels really smooth or has a similar feel to plastic, it is likely fake leather, it maybe PU or PVC, Faux leather also tends to stretch more than real leathe, but their back is woven fabric, you can touch, smell and feel, you will fine that’s toally different from the Genuine Leather.