Even though aerogel is very porous it is highly stable at both low and high temperatures.
Despite the light weight, aerogel insulates very efficient against electricity, sound and heat on can be applied to up to 650 °C warm subjects. On top of that it can be used in cold temperatures as well, as low as 200 °C.
Aerogel has a very low thermal conductivity (lambda) of 0.018 at 25 °C and therefore the material required can be much thinner to obtain the same energy efficiency or decrease in temperature in comparison to other insulation materials.
Aerogel, depending on which type, exists in various thicknesses and forms and with the right tools and machinery it can be cut and molded into almost any shape.