Aerogels: Thinner, Lighter, Stronger

https://www.nasa.gov/topics/technology/features/aerogels.html

Aerogels have been combined with batting to create insulating "blankets," as well as filled in between panes of glass to create translucent panels for day-lighting applications.

(in the thermal break in windows, but not yet in the panes for insulation.) https://origin-global.com/aluminium-windows/aerogel