Two scientists from Hong Kong claim they have found a solution to apparel companies' age-old problem of finding out how heat and perspiration affect clothing comfort - a sweating manikin called Walter. Fan Jintu and Chen Yisong of the Institute of Textiles and Clothing at Hong Kong Polytechnic University have invented a life-size dummy from pipes and pumps and covered by a waterproof fabric with minuscule moisture-permeable holes.