Phifer Solar Insect Screen 20x30 Mesh - Exterior shading - looks like a screen, but works like a sun shade. Phifer Solar Insect Screening offers the ultimate in insect protection while at the same time stopping up to 65% of the sun's heat and glare. This fabric also improves daytime privacy while offering excellent outward visibility. Phifer Solar Insect Screen works whether windows are open or closed. Standard roll length 100'. Fabric thickness is .015 inch. Openness factor approximately 32% and UV blockage is approximately 68%.