There are many kinds, the most commonly used is reclaimed leather, which is made by crushing broken leather into powder and 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;

I have been engaged in belt 13 years, and started a belt factory from grass-roots employees. I am absolutely authoritative. If you want to know more about belts, I'll give you a set of belt basic knowledge explanation training.

By the way, there is also a kind of belt that is all cowhide, some are composite and some are single-layered.