Polyester/Acrylic/Spandex Crew neckline, Banded cuff, Sleek stretch fit Ultra soft fabric, Heat retention, Quick dry and Light weight Anti static and Anti odor Machine Wash Cold Thermal underwear that feels like second-skin. Our best-selling base layer has been reconstructed with our Heat Plus fabric. The thicker fabric adds a new layer of wamrth while keeping its lightweight feel, to seemless underlayer.