Leather is just a durable material as long as you maintain it. 
Yeah! It definitely takes some caring for. Both my phone case and my wallet are leather, and I have to be very vigilant about keeping them in good shape!
It also depends on the quality of the leather, there are different grades of leather so that also plays a factor.
That makes sense! I'm sure there's a lot that goes into making leather goods - from the inherent quality of the raw product to how it's processed and tanned.
Exactly, it could also depend on the breed of animal. Some animals have tougher hides than others.
Oh, definitely! I work in an industry that handles sheep (and various other fiber animals), and there's clear difference in skin/hide even within the same species! The same animal can be specialized for many different uses.
Wow, I just learned something new. Can diet and living environment have an effect on the hide quality ?
I'd expect so! Farmers and ranchers can control for a variety of factors to get an ideal product. Certainly nutrition and standard of living would have an effect. 
That's good to know. What does your industry do with the sheep hide ?
Sheep shearing
Sheep shearing is the process by which the woollen fleece of a sheep is cut off. The person who removes the sheep's wool is called a "shearer". Typically each adult sheep is shorn once each year (a sheep may be said to have been "shorn" or "sheared", depending upon dialect). The annual shearing most often occurs in a shearing shed, a facility especially designed to process often hundreds and sometimes more than 3,000 sheep per day.
Sheep are shorn in all
for some armour, being both much cheaper and much lighter than plate armour, but could not withstand a direct blow from a blade, nor a gunshot.
Alternative names are "moulded leather" and "hardened leather". In the course of making the material it becomes very soft, and can be impressed into a mould to give it the desired shape and decoration, which most surviving examples have. Pieces such as chests and coffers also usually have a wooden inner core.
Various recipes for making cuir bouilli survive