This Car Window Shade by ZACAR is made from 80 GSM protective mesh on one side and 155 premium static cling material on the other. This provides excellent coverage and removes the need for suction cups. The shades block up to 99 percent of harmful UV rays because they have an SPF 50+ protection rating. The shades have a reinforced memory steel frame for durability. The pack of four shades includes two different-sized shades to suit a range of windows.