Dangerous. Only for rear seat windows

I was skeptical about them sticking to the window, but they actually do once they are pressed on. The problem with them though is they are almost opaque. I put one on the driver's side window and went for a drive. I looked out the window to see if anyone was coming and realized I could barely see anything at all. It is good that they are so dark from keeping the sun off of you perspective, because they other styles I have used still let enough light come in to get a sunburn or get hot. But unless you feel comfortable not using your side mirrors, I would not recommend them for the front seats. They would be great for the back seats though because the back seat passenger will get hardly any sun at all, and there is no safety issue for them.

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