convertible
I've got a really expensive open-top Mercedes*. (that has a massive fuel tank)
It's very rarely sunny here, therefore I have a rigid plastic roof that came from Halfords. It wasn't very cheap. It clips on top of the Merc, making it a bit like driving a rattly 2-seat saloon-car, but one that is more cramped inside than if I'd just gone and bought a normal car.
It's cool though, because underneath there's my really expensive Merc, and I make sure everyone knows it, and for 2 days of the year I take the roof off to prove the point of it being open-topped. I keep a raincoat in the boot just in case.
*(I haven't. this is figurative.)