I think you are asking the difference between leather and alcantara? Well, I am sure you know what leather is (usually cow hide), but Alcantara is actually a microfiber type cloth that mimics the feel of suade leather. I does such a good job at mimicking suade, that you would be hard pressed to differentiate real suade hide from alcantara. The benefits of alcantara is that it, for some people, feels a lot more comfortable and much cooler than compared to standard leather. It is also, I believe, cheaper to produce than leather, and, as it is fabric based, it doesn't involve the killing of an animal, which I guess most luxury car buyers don't really worry about.