The insulation must, of course, be top-notch. Aerogel is a good example. It is a solid with a very low density, as it is approximately 98 percent air, though it has a solid, porous structure. Most aero gels are silicon-based, but there are also gels based on metals or carbon compounds. Insulation is a hot item, of course. The Material Xperience show had examples such as the ‘EcoCradle’, a sustainable insulation made of chipboard.