It stops the sun like any other visor !!! Super satisfied. The suckers were protected by a small cardboard when I received. Either way they hold their own thanks to their size, they wedge perfectly on the rear window of my Citroen C4 hdi pack of 2007, 5 doors. The visibility is quite reduced in maneuvers in reverse, but it's worth it to protect children from the sun in the back; you only have to be more careful. Would definitely recommend, in addition, it has a very good value.