They're real leather, they usually use cowhide but use a few other leather types and some textile. They don't use fake leathers.

The leather is a lot softer and a little thinner than Schott, or Vanson. But I think the quality of the leather is still good. They use drum dying, at least on some jackets, which means the color won't fade as fast as a very cheap jacket. They're also made for riding, so they have to have fairly strong materials and stitching to survive sliding down a highway.

They have one jacket which says "0.08-0.09mm" thickness, and I think that has to be a typo, because leather that thin would be like paper. Fashion jackets don't even go that thin, they range from 0.5mm-0.9mm, so if you get a jacket with a thickness of 1.0mm and up, then you already have something unusually robust.