This glass is truly advancing the next generation of home windows to another level. LoE-366 glass is the ultimate performance glass. It just might make all other low-e glass obsolete. LoE-366 delivers the ideal balance of solar control and high visibility. It provides the highest levels of year-round comfort and energy savings. It’s also the one glass you can use to be compliant in every ENERGY STAR zone – in a double-pane window. Even our amazing patio doors come with this glass.