Nothing steams you. It's as if coolant runs in your veins. Or maybe it's the cool-inducing effect of your Armachillo® Undershirt. The silky, stretchy 4.9-oz. 91% nylon/9% spandex knit fabric is infused with microscopic jade that disperses heat – giving it cool-to-the-touch comfort unlike any other undershirt. Plus, it wicks moisture – never feels clammy or clingy like cotton can. Resists odor, too – keeps you smelling fresh when everyone around you is sweating up a storm. The just-right length lets you wear it tucked when the situation demands or go untucked on chill occasions.