The car window shade is made of static cling side(15S premium Static cling material) and one protective mesh (80 GSM which is the highest possible) that blocks up to most of damaging UV rays. Our car window shade avoid you and your baby exposed to sunlight for prolonged periods of time, keeping the car a lot cooler on the inside. These sun shade for car window has a thick layer of plastic liner that help stick to the windows, just apply a little pressure, and they stay until you are ready to remove them. Another mesh side provides protection while maintaining visibility for driver. And they are easy to remove every time. The sun shades are allowed to stick on the windows and remove them as needed, which provide the relative privacy and unobstructed view from the inside. The car window sun shade can fit most of car window, and can be overlapped to fit most window size, not only fit the driver side, windshield but also large windows like SUVs,minivans. Lightweight sun shade but super strong and durable with a sturdy wire all around. 4 pack car sun shades are easy to store and take up very little space. When you don't need them they fold up into a small storage pouch, taking up virtually no the space. And you can store them in the seat pocket behind the driver's seat so they are always immediately accessible. Package includes 2 pack medium side window sun shade (17.3’’X15’’) and 2 pack large rear window sun shade (11.8’’ X 19.74’’).