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Here is a simple test you can always preform to tell if the window (or any glass) has UV protection.
Remember the science stuff we all did in grammer school? Remember the science test we did with two plorizing lenses? When the lenses are parallel, the light goes through, but very slightly less intense. When one lens is turned 180 degress, the polorizing lines are now perpendicular, and no light goes through!
So how can this be applyed to your Boxster?
Take a polorized lens. We all have them if you have a good pair of sun glasses. Take two pair of sun glasses, align them, and the light will pass through. Now, turn one pair 180 degrees, and the light will be blocked! This will assure you that you now have a polorized test lens.
Now take that lens, and look through your side window or windschield. Everything should look fine. Now, rotate your head (be careful so you don't hurt yourself or hit someting while driving!!). As you rotate your head, if the Porsche glass is polorized, the light will eventually be blocked, as the two polorized lenses become perpendicular.
I hope this makes sense.
Have you ever noticed, when you have sunglasses on, that certain windows and glass in your car looks darker as you tilt your head? Or you see large dark spots, especially in your rear window? That's the polorization of the glass working, and fighting against each other.
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