4 PCS Car Side Window Sunshade Kit, 31.5" x 19.7" x 7.9" + 31.5" x 19.7" Freely Raise and Lower Windows Heat-Insulating Cover, Interior Privacy Protector, Universal for Cars (Black & Silver)

I use these along with a windshield shade to keep my car cool. It works! It's super easy to put them on and take them off and well worth it considering it keeps my car MUCH cooler than without.

I own a 2006 Scion XB, the covers fit perfectly for my back windows, but since my front windows are a bit wide, it doesn’t cover the entire thing, but it gets the work done

These magnetic window shades work great! They are super easy to use and thin enough you can store them in your car with out taking up much space at all. Highly recommend.