Designed to keep cars cool. It blocks heat and harmful UV rays from the sun, helping to maintain a lower interior temperature. Design: It pops open like an umbrella, making it easy to use and store. When not in use, it can be folded down and stored in a compact size, fitting in areas like the glove box or door panel. Some sunshades, similar to the one shown, may have features such as a reflective outer layer and an insulated inner layer for enhanced protection. While not explicitly mentioned on the packaging, similar products often use materials like a 6-layer sandwich of space-age materials, or a plasma coating to block heat.