Looking for a way to stay warm this winter without sacrificing style? Look no further than the Lithermo&Miyabi fiber T-shirt! Lithermo, a high-tech heat-generating polymer that absorbs infrared rays to generate heat. Miyabi, is a new tech heat-generating fiber, converting water vapor into heat energy, and water-absorbing properties to keep clothes dry.So you can stay toasty without having to wear a lot of layers. It is also very lightweight, so you won't feel weighed down by it.