From Endgadget: “The material that makes the magic happen is made of flat fibers that bring 35 percent more surface area in contact with your skin than traditional round yarns — and the more cloth touching your dermis, the better it can absorb and dissipate body heat. These flat fibers are bonded with a special compound that activates when wet (by water or sweat) and lowers the temperature of both the garment and the person wearing it.”