i also thought it would be no big deal to add leather, dealers do it all the time, my toyota had leather installed before i picked it up, when i asked about it i was told, our company will not have leather installed, there is a liability with airbags, if i wanted it i would have to get it done myself, that was said very matter of factly, they had a very cocky attitude, maybe he was having a bad day, i was near enough to the manager when he said it. thats when i decided to contact my toyota dealer to find out where it was installed and who made it. then i decided to go to knauze, they were pleasant, and when i mentioned the leather thing, it was no problem. i ultimatly had it done myself from the leather distributor but the dealer would have been all to happy to install it as well. oh! leather breathes, its isnt hot in the summer, synthetic is, and as for winter, i dont drive it in the winter but did have heated seats installed at the same time.vinyl seats will make you sweat and do crack far before leather does. when you buy a premium item like this you tend to keep up with it's maintnance, i condition my leather several times a year and my toyota looked almost new when i gave it to my son. i did my homework on this company, seems they are the largest manufacture of leather in the aftermarket, to the tune of almost 200,000 leather interiors a year.not in smarts but in most any brand, great stuff. i like it. i will try to put up some pictures