What kind of leather is oak cowhide?

Japanese cowhide.

Oak leather is Japanese cowhide and is one of the top leathers in the world. It is essentially leather tanned with vegetable tanning materials, so it is also commonly known as tree paste leather. The leather after tanning and fattening is soft and has a tight fiber structure, small extensibility, good formability, full board surface, elasticity, and no greasy feeling. It can be used for wallets, handbags, backpacks, harnesses, insoles, shoes, hat edges, belts and other leather products that are in direct contact with the human body.