This International Standard specifies methods for the measurement of the thermal resistance and water-vapour resistance, under steady-state conditions, of, for example, fabrics, films, coatings, foams and leather, including multilayer assemblies, for use in clothing, quilts, sleeping bags, upholstery and similar textile or textile-like products. The application of the measurement technique is restricted to a maximum thermal resistance and water-vapour resistance which depend on the dimensions and construction of the apparatus used (for example 2 m2·K/W and 700 m2·Pa/W respectively, for the minimum specifications of the equipment referred to in this International Standard). The test conditions used in this standard are not intended to represent specific comfort situations, and performance specifications in relation to physiological comfort are not stated. This document has been prepared by Technical Committee ISO/TC 38 "Textiles" in collaboration with Technical Committee CEN/TC 248 "Textiles and textile products" the secretariat of which is held by BSI (United Kingdom). The responsible German body involved in its preparation was the DIN-Normenausschuss Materialprüfung (DIN Standards Committee Materials Testing) (NMP), Working Committee NA 062-05-45 AA "Physiologische Prüfung von Textilien" ("Physiological testing of textiles").