This is easy and just right – I purchased for my 2nd generation Mazda CX-5 back windows. It’s easy to install. Just on magnets. My kid can fit. I didn’t try bring the window down while driving. Guess that’s not possible with magnates.

Filters sun rays very well. When at driver seat my arms were frying my wife and kid back seat had no such feeling whatsoever. Hope the UV protection is effective enough.

Cost is really high though.