Ultimate Sun & Heat Protection: EcoNour Sun Shades are crafted from tough 240T polyester to cover your trucks windshield and side windows, blocking harmful UV rays and reducing heat, so your truck stays cooler and more comfortable. Reflective & Insulating Design: The high-quality silver reflective material deflects 98% of UV rays, while the heat-insulating backing lowers interior temperatures by up to 40°F, offering serious relief when parked under the sun.