A solar shade’s openness factor is a measure of how much light it lets in. Solar shades are designed to reduce harsh glare and UV rays while still allowing you to see through them. The openness factor is expressed as a percentage, which indicates the amount of light being let in. A higher percentage will mean you preserve more of your view during the day, but let in more glare and UV rays, and have less privacy at night. The most popular openness factor is 5%. We recommend ordering swatches before placing your order so you can decide how much openness you’d like for your shades.