Material: Polyester Product Dimensions: 83.5 cm length x 147 cm width Closure Type: Velcro [12-Layer Polymer Insulation Material & Umbrella Design] The umbrella surface uses 12 layers of nano-polymer insulation material, with a titanium silver coating on the outside, which reflects strong sunlight to suppress the rise in car interior temperature and can also block 99% of harmful UV rays, creating a comfortable car interior space. Adopting an umbrella design, there is no need to install it in advance when using it; you can simply open it and use it. When not needed, you can fold it like an umbrella and put it in the storage bag, saving space. It saves the trouble of installation and is convenient for storage. It's compact like an umbrella and easy to carry. Used only once and not used since. Stored in a dark place after that.