In recent years more importance has been given to the comfortable use (comfort) characteristics of garments. With the increase in the performance demand of the fabrics used in various activities, the analysis and evaluation methods of these produced clothing products have been brought to the agenda. Different test methods and devices have been developed to carry out these analysis and evaluation studies.

The most important test methods for measuring and analyzing water vapor permeability of textile products are:

• Turl Dish method
• Sweating guarded hot plate method
• Upright and inverted cup (UICM) method
• Revolving platform method
• Porous convection / diffusion test method (dynamic moisture permeation cell, DMPC)
• Permetest (ISO 11092 standard method)

However, there is no correlation between these test methods and the values ​​obtained from each test method are different from each other. In addition, there is no established standard value for water vapor permeability in the world. This is of course a serious problem in terms of comparison and acceptance of test results.

However, if a general assessment is made, the following results are noteworthy:

• The most appropriate test temperature should be the temperature closest to the body temperature, 37. However, the temperature values ​​of each method are different. In this respect, the most appropriate method is to comply with TS EN ISO 11092 standard.
• The device that can be obtained in the shortest time is Permetest device which works according to TS EN ISO 11092 standard. However, while all test methods have a certain sample size, the sample size is not important in the Permetest method.

Water vapor permeability tests are applied in authorized laboratories in accordance with the following standard: TS EN ISO 11092 Textiles - Determination of physiological properties - Measurement of thermal resistance and resistance to water vapor under stable conditions (fog protected hot plate test)