Bronya thermal insulation is composed of 80% microspheres; respectively, only 20% of the binding agent can conduct heat due to its thermal conductivity. Another part of the heat transfer depends on convection and radiation, and because microspheres contain rarefied air (the best insulator after a vacuum), the heat loss is minimal. In addition, due to its structure, the material has a low heat transfer from the surface, which plays a decisive role in its thermal properties.