I looked up Mazda CX-30's, what this started with. They have Black Leatherette. Found this about Leatherette, "...what is leatherette? It's a synthetic surface, usually made of vinyl or a type of plastic that is meant to simulate the look and feel of leather..." Sounds like maybe it might get leg scorching hot
If it’s not leather and it’s not cloth, it’s probably vinyl. I had an Audi with a perforated “leatherette” interior and when I got rid of the car 7 years and 130k miles later, the interior still looked great. I don’t recall it being any hotter or colder than actual leather, but it was a lighter gray color which likely wouldn’t be as bad as black. On the other hand, we have some leather furniture that looks used and I can already tell the same will likely happen with the leather in our Mazda CX-9. There are disadvantages to the natural material.