For those of us that live in the North this is exactly what the Prius needs to finish off the comfort necessities. CarTek Seat Warmers installed under Wet Okole Seat Covers Installed new seat covers for the front and rear using the Wet Okole Seat Covers. They are great quality and stretch over the existing seats without too much difficulty. You do have to remove the rear bottom seat to get the cover on in the back due to the center seatbelt. See all the information at http://www.WetOkole.com. The Wet Okley also include a lumbar support via a hand pump that makes the seats much more comfortable on long trips. Yes, the Wet Okley are not inexpensive. I had about $729 in the front and back covers. CarTek seat warmers are installed under the Wet Okole covers making a nice warm seat in the winters of Ohio. Seats are warm within a couple minutes. Great addition for under $200 dollars. Cartek Distributing LLC Additional pictures can be seen by clicking on my signature.