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Our bodies lose a large fraction of their heat by radiating it to the environment, but clothing designers rarely try to control this radiation. A new theory proposes a wearable, reversible fabric that would emit close to zero radiation from one side while emitting a large amount from the other [1]. Unlike previous reversible fabrics that were made from impermeable membranes, this new fabric would be composed of microfibers, which would be more comfortable to wear. The thin fabric could be worn one way to keep warm in a cool room and flipped inside out to keep cool in a warm room. Energy-saving thermostat settings could then be used without causing discomfort.

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