I'm taking delivery of a Model S 85kwh on Saturday, and I have one question to ease a worry I've been having. I have the leather seats (not performance), but I didn't get the extended leather. Though I know the areas that it covers, I'm curious as to what is there if you do not order that option. Is it synthetic, or is it a completely different material? Also, I'm brand new here, so sorry if this has already been asked. I did search, but the forum posts that the search turned up were not my exact question.