Abstract: A sun protection system for a vehicle. The system assists maintaining interior temperature level of vehicle. The system includes a series of one or more rigid retractable, darkened, translucent plastic material panels. The panels are retractably installed inside door panels of side windows. The panels are incrementally retractable independent of side windows. The panels are manually or automatically configured to cover or expose one or more portions of side windows responsive to at least one of current detected interior temperature level, amount of sunlight entering the vehicle, or maintain an interior temperature level responsive to a predicted interior temperature level of the vehicle.