The coating of IsomaxTERM reflects the heat as a mirror and thus reduces the heat losses through the walls. The special microspheres are closed elastic round cells with very small surface area which absorbs heat energy only on the surface and immediately emits most of it back. Because of this reflecting effect the intensity of heat transfer through the walls is reduced and thus the heat loss is reduced. The extremely low density of the microspheres leads to low density of the coating, hence the increased insulation capacity. 1 litre weights only 500 grams!