I tested it before and after installation and the temperature in my car dropped about 20 degrees. Once I left the car without it for an hour and checked the temp, then installed it the next day and left the car for another hour. It was summer in Florida when the outside temperature was over 30 degrees. It sags in the middle. But I'm 1.80 tall and he didn't touch my head. But it happened in the back seat when my seats were all the way up. I'm not sure if it was supposed to stay still while driving, but I drove down a residential street with the windows down and it stayed. But when I did the same on the track at 70 km/h, the clips came out. Also note that the installation required two people, but when it hit the freeway I was able to deploy the clamps myself after stopping. I will leave it installed all summer and will probably remove it during the winter months. I will still not open all the windows in the summer.
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