Succeding to Report I, to determine the effect of opening conditions and areas of clothes (10%, 20%, 30%, 40% of total area) on the warmth keeping properties, cooling method was employed by using Latin Square Design. The following results were obtained: 1) The warmth keeping ratio was varied with the opening conditions and the ercer was downward, upward, horizontal and up & downward opening 2) The size of opening areas was in inverse proportion to the warmth keeping ratio. 3) In the horizontal opening, the thickness of air layers in clothes did not effect on the warmth keeping ratio.