I have never used sunscreens for vehicles that did not have suction cups. I was concerned that these would not hold up as well because there was not any suction cups. The rubbery material on the backside of the mesh sunscreens did an absolutely wonderful job clinging to the windows. I was actually quite impressed. The larger sunscreen did come with a suction cup and the suction cup has held well. I did make sure the windows were very clean prior to hanging the sunscreens, not sure if that actually made a difference or not. I am pleased with the fact that the set came with 2 storage bags to keep the sunscreens safe from tearing when not in use: one for the 2 smaller sunscreens and another for the larger sunscreen. I drive a large SUV and wondered how they would fit on the larger windows but it covers plenty to keep the seats and back of the vehicle shaded. Definitely a good buy.