It's good to have a sandwich, and it can be less deformed. Leather is characterized by becoming softer with use. Therefore, the interlayer can keep its shape unchanged, and the interlayer in the middle can play different roles according to different materials.

There are many kinds of interlayers, the most commonly used one is reclaimed leather, which is made by crushing broken leather into powder, mixing it with glue and compressing it; There is also a kind of PVC, which is a chemical component and belongs to plastic; If you buy a very high-grade belt, the interlayer may be real cowhide (but it must be two-layer cowhide, and the interlayer cannot be made of the first layer cowhide).

This sandwich is called sandwich in the belt industry;