The material was designed by a team of researchers at the University of Chicago led by Po-Chun Hsu, an Assistant Professor of Molecular Engineering. They designed it to block more than half of the radiation from the buildings and the ground. As reported by New Scientist, the material emits heat in the form of infrared radiation into space, while reflecting the sun’s radiation and infrared radiation emitted by surrounding structures, such as buildings and pavement.

The researchers developed a three-layer textile, where the inner layer is made of common fabric, such as wool or cotton, and the middle layer consists of silver nanowires that reflect most radiation. The top layer is made of a plastic material called polymethylpentene, which emits a narrow band of infrared radiation. Outdoor tests found that the material stayed 16ºF cooler than a regular silk fabric and 4.1ºF cooler than a material that emitted radiation across a broad range. On skin, it was 3.2ºF cooler than cotton fabric. Hsu believes these small differences in temperature could theoretically increase the duration of someone’s comfortable exposure to heat by up to a third.