ISO 9920:2007规定了基于已知服装、套装和纺织品的值估计服装套装在稳态条件下的热特性(抗干热损失和蒸发热损失)的方法。它研究了身体运动和空气渗透对隔热和水蒸气阻力的影响。它不处理服装的其他影响，如水的吸附、缓冲或触觉舒适性，考虑雨雪对热特性的影响，考虑特殊的防护服（水冷服、通风服、加热服），或处理身体不同部位的单独绝缘和由于服装套装的不对称性而引起的不适。

ISO 9920:2007 specifies methods for estimating the thermal characteristics (resistance to dry heat loss and evaporative heat loss) in steady-state conditions for a clothing ensemble based on values for known garments, ensembles and textiles. It examines the influence of body movement and air penetration on the thermal insulation and water vapour resistance. It does not deal with other effects of clothing, such as adsorption of water, buffering or tactile comfort, take into account the influence of rain and snow on the thermal characteristics, consider special protective clothing (water-cooled suits, ventilated suits, heated clothing), or deal with the separate insulation on different parts of the body and discomfort due to the asymmetry of a clothing ensemble.