Physiological and sensory responses, particularly paid attention to the skin wettedness under clothing at constant average skin temperature, were observed in two male subjects while they were seated on a balance. The clothing ensemble had an effective insulation of approximately 1 clo. From the analysis of the present experimental data, the following conclusions were found regarding characteristics of wettedness observed by clothed subjects at a constant average skin temperature, 1. Wettedness correlates negatively with the air temperature and correlates positively with the vapor pressure.