The first and basic reaction of a man to perspriation is to remove his clothing. But in doing so, it causes a sudden drastic drop in skin temperature (while moisture evaporates), which is actually not a healthy practice. By wearing Teviron Negative Ion undershirt, man can keep it on. Sweat is quickly channeled through the fabric and evaporated, while the "cool-off" period of the skin is still protected by the warmth of Teviron Negative Ion undershirt. Material: 95% Teviron; 5% Polyester. Color: White Size: M,L