This experiment was conducted to determine the heat loss by the amount of perspiration from human body. Warmth keeping ratio determined by using cooling methods were as follows ; 1) The higher amount of moisture evaporation, the higher amount of heat loss was resulted 2) The cold feeling was found at the level of moisture content in clothes above 0.017 cc/$cm^3$ (amount of moisture evaporation; $160 imes10^{-3}cc/cm^2{cdot}min$) 3) There was no relationship between the characteristics of fabrics(kinds, density, were factor, moisture transpiration) and heat loss at the same moisture content.