clo

clo textiles USA For clothing, a measure of thermal insulation, one clo being nominally the amount required for maintenance of body temperature in typical sedentary indoor conditions, i.e. at 70°F, relative humidity ≤ 50%, air movement ≤ 10 ft per minute, the body temperature to be at 98.2°F with metabolism at 50 kilocalories per square metre per hour. Gagge A. P.,, Burton A. C.,, and Bazett M. C. Science 94, 428 (1941)
Ipso facto, this is equivalent to a normal business suit plus medium underwear and about a quarter of an inch of clothing. Hence:1 clo ≈ 0.18∼ K·m²W⁻¹ (0.88∼degF·h·ft²·B.t.u.⁻¹, 1.54 tog).