Coverking's Sunshield Ultra is the latest high-tech development for controlling sun damage in parked vehicles. Blocking 99.8% of heat and UV radiation, the Ultra offers the ultimate protection for auto interiors. They are made with a unique three-layer construction: The top layer is a 300-denier polyester coated with silver polyurethane to reflect most heat and UV rays; the second layer is made of a unique, high-density polystyrene that offers total insulation, while the third layer is a soft polyester felt that both protects the insulation and encapsulates the sunshield.The Ultra comes with vertical creases to facilitate easy folding and compact storage and is custom cut to the exact shape of your vehicle's windshield. This custom shape completely blocks any light from penetrating inside the vehicle, and the cover is finished off with a matching felt binding.