Our Skivvy Tank, inspired by the U.S. Army's 'UNDERSHIRTS, SLEEVELESS' from World War II, is crafted from tri-blend cotton, modal and spandex. This fabric, known for its good stretch and air permeability, ensures a comfortable fit. The micro-ribbing duplicates that vintage look while enhancing the comfort, allowing for freedom of movement and a sense of nostalgia to help you Stay Zero. ● Soft Undershirt with Stretch ● Cotton Blend: 48% Cotton, 48% Modal, 4% Spandex ● Machine Wash Cold, Non-Chlorine Bleach, Tumble Dry Low, Iron-Low Heat, Do Not Dry Clean