They aren’t double pane windows, they are laminated. Double pane is like the windows in your home that has a space—pocket of air that acts as an insulator and sometimes contains a gas as well—in between two pieces of glass. Double pane windows in a vehicle are virtually rare, but have been done in the past. Laminated glass is essentially a safer glass in your car, and the windshield is a perfect example. When the windshield “breaks” it doesn’t shatter or smash like tempered glass does. It “peels” due to the fact that the outer and inner glass is sandwiched and bonded with a piece of plastic between them. It’s also a great insulator of noise, and makes it very hard to break into your vehicle too. The folks who have the previous version of glass in your side windows have a tempered glass, which shatters into tiny pieces when it’s broken. So there’s a lesson on the proper naming for the new windows in the Model Y. AND, just so you know, from the pictures I’ve seen in other threads, the back windows are still tempered glass, and NOT laminated......from what it looks in the pictures I’ve seen. I used to work in a glass manufacturing plant, so I know a couple few things about glass, lol. We also made tempered and laminated glass, as well as the flat glass in home windows.