Reflective glass is a kind of glass with a metallic coating at the back. The result is a glass, reflective enough to bounce off heat and radiation, but not enough to act as a mirror.
Reflective glass involves spraying and coating metallic oxidants on either surface of glass substrates. Since the coating moderates the reflectance of both heat and radiation, buildings fitted with reflective glass have reduced heating costs. Reflective glass also makes for aesthetically pleasing choices, with different colors, ranging from blue to green to pink.