[Auf los!]

There is also the Reflectionite Cool Cap, and an "interior car cover," sold by Perf Prod that I've been looking at. Not sure if the latter will work well if the top is up.

I have used the Calif Pop-top and the Cool cap, because I want to keep the sun from killing my full leather interior. Both are made of Tyvek, the Cool cap having a metalized top surface, which is super-reflective, in fact, blinding when you install it.

After a couple of summers the Cool cap began to disintegrate. It is also a lot more complicated to attach than the Pop-top. Even though the Pop-top doesn't fit my car perfectly, I've used it a lot more, and when it begins to break down, I will probably get a new one.