ION Seat Towels are a great, pratical seat cover solution. 

Simple to take on and off when you want to use them, the ION Seat Towel have an internal waterproof lining with an absorbant towel exterior.

Just put them on when you need and you'll keep your seats dry and protected.  Once you're home and dried off you can remove them in seconds, and your seats will be all dry and ready to go again.