Sol-R® shield plus 366 delivers the ideal balance of solar control and high visibility. And it provides the highest levels of year-round comfort. It’s also the one glass you can use to be compliant in every USA ENERGY STAR zone – in a double-pane window. Couple it with Low-E 180®, and you’re compliant in the North. Its low SHGC makes it compliant throughout the rest of the USA as well. What’s more, Low-E 366 provides exceptional fading protection as well. It blocks 95% of the sun’s damaging ultraviolet rays (a leading cause of fading), so it will help your furniture, carpets, curtains and wall coverings stay beautiful for years to come.