Passive radiative cooling is a natural process in which an object or surface emits thermal radiation into the cold sky to prevent it from heating up. Daytime passive cooling technology requires a selective design to reflect incoming solar radiation and simultaneously emit thermal radiation to the cold universe through the sky window 8–13 µm. In this study, we propose multilayer design of cooling device consisting of bilayer of polydimethylsiloxane foil (PDMC) and aluminum nitride (AIN) both deposed on silver coated glass. The spectral radiative properties of the proposed device are examined using the transfer matrix method. Numerical results show that our design acts as infrared optical window, as it has a high solar reflection with an average of over 96 % and strong thermal emissivity in atmospheric transparency window with an average of over 90 %. In absence of parasitic heat exchange, high cooling power of 107 W/m2 at ambient temperature with an effective temperature drop of 45 K below the ambient are obtained. The cooling effect persists even in the presence of parasitic heat exchange with temperature reduction of 17 K below the ambient. To assess the validity of this study, the performance of the multilayer design is compared with an experimental black emitter and the results indicate that our design has good properties in terms of temperature reduction. In the light of our findings, we can state that our design can fundamentally enable new methods for advancing the applications of exploiting radiative cooling.