The seats in your car are of primary importance to your comfort as a driver or passenger. They can be covered in cloth or fabric and they may have added options like being heated or cooled. Your car's trim level will often affect what material the seats are made of and whether or not they are heated or cooled and sometimes even can affect how adjustable they might be for your comfort. Car seats for performance will have a different overall structure and shape than those that are intended to make a car comfortable for a long drive.
Driving around in a car with torn cloth or leather, lumpy or flattened stuffing in the seats, or broken levers and other adjustment components is both uncomfortable and also can be dangerous. If your car seats need repaired or replaced, it is important that you buy replacements that were made for your car. Shop for your BMW Z3 seats here.