Material with hygroscopic heat generation. It is mainly used for inner. By converting the moisture (sweat) coming out of the body to heat with a heating value three times that of wool, wraps the body warmly. Also, on the front side, sweat-absorbing quick-drying material "Aqua Stealth ™" is used in combination. It spreads sweat smoothly, prevents steaming inside the wear, and has the effect of making the body less chilly.