I've got custom fit sheep skin seat covers on both my current cars. I had them on the previous three as well. I'll probably order a set made for my upcoming Cayman prior to it's scheduled delivery later this year. They're warm in the winter and cool even in the hot summers where I live. At first glance, they look like a factory item and you have to look pretty closely to see that they're after market seat covers. They're not cheap, but I really like them. They seem particularly advantageous since the bolster wear on Porsche seats is an issue. It's not uncommon for an older Porsche to look nearly new except for ratty seat bolsters.