In Texas it is legal to add a "clear" window tint film to your front windshield. In the past you would of needed a doctor's prescription but Texas allows window tint no darker than 70% applied to your front window shield. Any window tint listed at 70% or higher is considered a "clear" film. Make sure your chosen 70% film is not a basic or cheap film. You will want to use a ceramic or infrared film, no dyed films as this will turn purple and obstruct your driving view. IR films and ceramic films are designed to block and reduce the most amount of heat without having to be very dark. If you are going to tint your windshield do not use a cheap film.