Aerogel

A piece of aerogel insulation protecting a flower from a torch.

Aerogel is a gel in which the liquid part has been replaced with a gas (usually air). The most common type of aerogel is silica aerogel, which is made from the same molecule as glass. It is a solid material that is almost as light as air. Aerogel is the best thermal insulator available and can be used in construction in place of fiberglass insulation.