Andersen now offers a glass option for windows and doors that provides you with a desirable balance of high visibility and comfort. We call it SmartSunTM glass because of the way it cleverly rejects unwanted solar heat while allowing the sunlight to stream through. It gives you another choice in addition to High-PerformanceTM Low-E4® glass with its sparkling clarity and High-PerformanceTM Low-E4® Sun glass with it's appealing tint. SmartSun glass also helps protect your furniture, carpets, and drapes by blocking out 95 percent of the damaging ultraviolet rays that can cause fading and it can be instrumental in reducing energy consumption. So, now when you choose the glass for your windows and doors, your choice is more clear.