STONE WOOL

Rockwool insulation refers to a type of insulation that is made from actual rocks and minerals. It also goes by the names of stone wool insulation, mineral wool insulation, or slag wool insulation. A wide range of products can be made from rockwool, due to its excellent ability to block sound and heat. This type of insulation is commonly used in building construction, industrial plants, and in automotive applications.

Your choice - it's just a choice of one of the major systems: