This is what I have. The foil blanket makes a big difference. When the interior is cool, after AC, the fabric is cool to the touch.The fabric is black mesh, so it provides mild effect here. It also came with a separate reflective foil blanket I can layer on top for stronger sun blocking. I'll test it soon on summer vacation in the mediterranean where it's scorching.
However, after heat soaking the car in full sunlight, the fabric does feel warm, because of the radiant heat of the dark roof...which has high quality aftermarket film installed.