Any Leather that is in the mazda is bonded leather, this is a good thing as non bonded leather is a pain to care for and wears rather easily. I think it's something like 60-70% of all Mercedes are sold with their fake leather MB-tex. Why? Because it still feels nice, looks nice, and lasts a lot longer. Others are correct that anything that touches your body is leather, mainly the seat bottom on the back rest, the sides of the side bolsters and seat back or Pleather, mazda doesn't have a cool name like MB-tex or anything for it.
That being said, the bonded leather will is still some one porous and applying a quality leather conditioner will help keep the leather surfaces looking fresh and supple. I was just reading a post on Meguiars online from Bob Stoops (the Meguiars Guru who works for Meguiars) and he confirmed what I just said. Leather protectant and conditioner is a good thing to use on the seats as it will help stop the wear of the "plastic" layer on top and eventually work it's way into the leather underneath. I just picked up Meguiars Ultimate Leather balm and was really impressed with the results it gave the seat, it even smells like pina coladas! Just be sure to apply very thin coats and not press hard into the perforated seat areas as it will fill the holes with product. Any protectant or conditioner is a good bet. 303, Megs low shine interior protectant, Mothers VLR, Ultimate leather balm, Lexol twins are all good products and you should use them on the leather seats, even if they are bonded.