Windshield sunshades are most important for keeping your inside from UV rays when holding your car or truck cooler in the course of warm

https://astro-wiki.win/index.php/Choosing_the_Right_Time_of_Year_for_Windshield_Repairs_and_Replacements

Windshield sunshades are important for preserving your interior from UV rays at the same time maintaining your car or truck cooler in the course of warm summer time days—make investments accurately!