Imagine having an item of clothing that cools you in summer and warms you in winter. A sweater that, based on its surrounding environment, regulates its own temperature in response to your personal comfort. Soon that could become reality as scientists at the University of Maryland have created a new kind of fabric that does exactly that. The innovative textile allows more heat to pass through it in warm, moist conditions (like those of a sweaty body) and reduces heat escape in cooler, dryer conditions. The inventors say it shouldn’t take long before you can add such smart clothing to your closet.