Inside cars, seat covers and interior cladding of the roof are the places where PCMs can be used.
During trips or when you’re in the car for a long time (mostly during the summer) your back sweats and it may annoy you. So PCMs can help develop a desired temperature between your back and the seat; not only it doesn’t make you sweat; it also helps you enjoy a desirable vacation.
Also during winter when it is cold outside you can make the best of your trip by using the heat produced by PCMs in your car seat.