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INTRODUCTION Competitiveness of breathable waterproof fabrics are determined by the two conflicting properties;breathability to remove sweat and resistance to the penetration of rain or snow.Advanced technologies have solved this conflicting problem by selecting appropriate membranes and their pore sizes.The breathability of the fabrics is often tested at the standard condition or at high temperature where the molecular movement of water is very active.But the actual condition could be much different from lab test conditions and mostly worn at low temperature or cold conditions.Therefore,molecular movement of water molecule is not active and condensation or freezing on the surface of the membrane can deter the breathability.In this study,the effect of environmental temperature on the breathability is discussed in terms of pore sizes and how it affected to the microclimate temperature and humidity.