Had a 3 zip tonneau cover on my last car and it was brilliant with the drivers side in place the reduction in drafts and extra retention of heat made a massive difference and you can use it with or without the side screens. Mine was from Allon & White and was altered a couple of years later to fit a Librends roll bar I had added, cost was about £650 from memory but that was a few years ago.
Current cover is the Morgan factory one which I need to get round to altering to 3 zip as it is noticeably colder, and winter hasn't even arrived yet.
