![]() There are sunshades specifically designed to fit the inside of the front windshield of the car, and others designed for the car's side windows, or the back window. Typically, sun shields are made of a layer of mylar or aluminum foil which covers the inside of the car's windows, to reflect the sun's rays away, and preventing the interior from being exposed to those rays. There are several variants of car sun shade types. Sunshades may also be used while resting in a car, creating a sense of privacy and blocking out most of the undesired outside light from the sun in the daytime or from other cars and street lights at nighttime. Prolonged exposure to direct sunlight can also make the dashboard fade and eventually crack, or cause damage to items left in the car, such as mobile phones, laptops and other electronic devices. This is dangerous for adults, children, and animals. ![]() Without any protection, the sun can heat up a car's dark dashboards to 69 ☌ (156 ☏) within 60 minutes. Sunlight passing through the car's windshield produces the greenhouse effect, heating the interior to a temperature much higher than the outside air. During the summer they help decrease the inside temperature of the parked cars or protect passengers from direct UV rays. Some windshield sun shades have a reflective surface to bounce the light without hitting the objects in the car, reducing the interior temperature.Ĭar sun shades are mainly used in environments with strong and direct sunshine, and thus their usage is mostly seasonal and tied to the weather of countries. The visible light that passes into the interior through the windshield is converted into the infrared light which, in its turn, is blocked by the glass and gets trapped inside, heating up the interior. But it can't protect from the visible light that mostly penetrates through the window and gets absorbed by the objects inside the car. Typically, the glass of the car's windshield itself blocks most of the UV light from the sun, and some of the infrared radiation.
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