ASHRAE标准55-1981和ASHRAE手册第8章——1981基本原理规定了大多数人在不同的衣物隔热和代谢活动水平下可以接受的热环境条件。这些文件的使用者有必要确定哪些类型的衣服提供不同程度的绝缘。结果表明，根据织物厚度和服装覆盖的体表面积，可以准确地预测服装隔热值。总而言之，整体重量（不穿鞋）和不同织物层数覆盖的体表面积是整体隔热的良好预测因素。

ASHRAE Standard 55-1981 and Chapter 8 of ASHRAE Handbook—1981 Fundamentals specify the environmental conditions that are thermally acceptable to most people at different levels of clothing insulation and metabolic activity. It is necessary for users of these documents to determine what types of clothing provide different amounts of insulation.Results indicated that garment insulation values can be predicted with accuracy from fabric thickness and the amount of body surface area covered by the garment. Together, ensemble weight (without shoes) and the amount of body surface area covered by different numbers of fabric layers are fairly good predictors of ensemble insulation.