Here we analyze two state – of – the - art passive radiative cooling coatings. Radiative cooling materials emit radiation that goes directly to outer space through the atmospheric window while the percentage of radiation that they absorb is as low as possible. The atmospheric window is the window of 8 – 13 μm, where the infrared radiation passes immediately to outer space without any significant absorption by the Earth’s atmosphere. Thus, it manages to acquire sub – ambient surface temperature which can contribute to improving the thermal comfort conditions in the buildings, the energy conservation, the mitigation of the urban heat island effect while it can also be used for low – grade heat dissipation from power stationsBased on the most recent research papers, we fabricate two radiative materials and we study their performances.