I had extendable ones with a suction hole. My car is a Nissan Juke, so the rear windows are very small and compact, so it's not easy to find a window blind due to the size. This one worked great, as did socks. I had retractable umbrellas, my niece broke them. She broke the vent and the small stick holding the sun visor straight. Since I will often drive them and pick them up from school, I had to find the best solution. I also have a toddler who will fall into the category of kids being kids. This was a longer term solution. Close the entire window, which I think is best, and I can roll the window down. Protects against mosquitoes/bugs or dirt. I think it's a win-win situation. I got it for $10 when I bought it with a coupon which is pretty cheap. I didn't leave it on all the time. I always take it off when I'm done. It's an extra step, but I feel like if I leave it on the morning moisture or bugs get stuck underneath. I haven't tested it, but I'll let you know when I do. Happy with my door socks so far lol. They are great and provide better sun protection by covering the entire window, not just a small square area. Pros: Covers the entire window, more protection than traditional suction cup parasols. Can lower the window and provides additional protection against insects. Mosquitoes especially as we are in a very humid area which bring in too much. Cons: A bit big for my car windows but I have a Nissan Juke which is small. still worked. Not the fault of the product. That's all. I will update but so far this is my experience of two weeks of almost daily use. I use them at least 5 days a week, school days.
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