We conducted an outdoor experiment using mannequins wearing different colored clothes to clarify the effect on surface temperatures. Experimental results showed temperatures of dark-colored clothes were higher than that of light-colored clothes by 10℃ during the daytime. Referring to ISO 7243, we also examine the heat balance equation of human body from the viewpoint of metabolic heat production caused by changing colors of clothes. Temperature differences of clothing colors in WBGT were very large, up to 5℃, and wearing clothes of light colors are strongly recommended from the view point of the prevention of heat stroke.
