The purpose of this study is to evaluate thermal wearing comfort of underwear made by blended yarn with polypropylene(PP). As a result of a wearing experiment, comfort factors of PP underwear were extracted as thermal and water transport property and skin contact feeling. By combining PP with modified cross-section polyester, sweat could be transferred to outside of clothing and its thermal insulation property prevented cooling body. The useful underwear materials could be made by adding the water transport property with the structural approach to PP.
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