In preparation for this summer, I want to install some kind of sun shade for the rear glass. I have been using Jumbo shades when I park, but short of a louver, is there anything I can install that will reflect most of the sun and still allow me to see out while driving?

 

Metallic tint...like the cracker wantabees

 

I already have decent tint and don't want to redo it cracker style.

Does anyone make that material they use for child side window sun shades but in a larger size?