They're vinyl. Of course they're cold in the winter, hot in the sun. But they are durable and they fit very well. They look great and will last quite a long time. Make sure you get the ones for your seats, ie with or w/o airbags. And install them on a warm day, installation can be a workout if the video is any indication. I'm sure you'll love them as much as all the other owners of them around here do.