It seems that they do work. Definitely a bargain. No complaints. Great product and customer service as well.

Took time figuring out how to fold it properly. No flaky mess from the material. Easy to unfold. Works well to keep my car cooler.

Sizing chart showed the same size for my 2007 gx470 and 2014 bmw 335. Prefect fit. Big enough to cover my gmc savana's windshield.

Also came with 2 small auction cups for the top. I leave thesuction cup hooks in the corners of my windshield to save time.

Temps here in southern arizona are extreme. Keeps leather seats from getting too hot. Car stays pretty cool when i remember to put my shade up.

The shade is to large for the windshield. It has no strength to the frame and is very hard to put up as it just falls all over the place. The suction cups are just plain inconvenient. It is flimsy.