Leather is actually made from animal skin, which is made flexible and smooth by first removing the hair from the skin, and then tanning it. Unlike your leather couch in the living room, car leather seats are quite different as they are exposed to a variety of detrimental conditions such as extreme heat and the harsh UV (Ultra-Violet rays from the sun) and the use of air conditioning in your car. All these factors contribute to considerably reducing the life of leather by breaking down the naturally occurring oils in leather which keeps it looking and feeling soft and supple. Due to this, the seat leather can start to break or crack if nothing is done to soften it. This can make it unusable, and you may have to throw it away. As leather goods and accessories are very expensive, this is not a favourable option. In such cases, the best thing one can do is to soften it.

Please follow the link below to read more:
https://www.spotdem.com/2019/04/07/how-to-prevent-leather-car-seats-breakage-wearing-out/