I don't know where to really post this but since I always am on the budget thread and I don't want to waste my money....you know the long cardboard thing that you put in your front window when you leave the car for the day, does it really keep your car cool. I am going to be driving to the parks each day and was wondering if it would be wise to invest my money into this.

I have started taking my sunglasses into the office with me to keep them nice and cool.