Keeps you warm, but not completely. Also couldn't install my Nissan Altima's windshield properly because the suction wasn't strong enough to hold it or the windshield was too long, but I suspect it was the suction. I put them in water before use because they warped a bit but it didn't even work. I wouldn't recommend it simply because it wasn't long enough, the suction cups didn't stick and it didn't cover the entire windshield. I have a small car and should be enough and fit, but it wasn't there.
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