I thought Vanson had only two types of leather, competition weight and firenze. I don't see the Z-150 mentioned on there website.I think that jacket is made with the Z-150. It's a slightly "lighter" hide than the full comp weight...I had a Derby in it...really great stuff and more than heavy/thick enough for my liking...can't wait to see more pics Nick. Love the plaid too! I believe this jacket is SOLD OUT and no longer available