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For mountaineering, the outer or protective layer of clothing system is especially important for extremely environment. Generally, a breathable barrier embedded in the layered fabric will be used to prevent rain or snow from outside and let the body moisture diffused into air. There are two types of membrane, one is hydrophobic (HPO) and the other is hydrophilic (HPI). A considerable amount of studies claimed that water vapor transport through HPI polymers is highly influenced by the test conditions [1]; in non-isothermal test, the clothing systems incorporating HPI polymers are improved to greater amounts than those incorporating microporous polymers [2]; some experimental results further point out that the water vapor transfer rate of porous polyurethane laminated fabric was greater under isothermal conditions whilst the water vapor transfer rate of HPO laminated fabrics was greater under non-isothermal conditions, especially when a fabric contains more condensation [3]; and, with the use of hot plate and sweating arm system, an EMPA study showed the hydrophilicity and condensation have little effect on effective water vapor resistance of multilayer textile combination in 20 °C but become larger with decreasing outside temperature [4]. In our previous study, the difference between the microstructure of PTFE and the hydrophilicity of PU affects the comfort properties of leisure wearing especially in mild and cool temperature, water vapor resistance testing (Ret), EMPA sweating torso wearing trial simulation, and subjective wearing trials were conducted. The HPO is better in Ret test, though the HPI is slightly better in the non-isothermal state. While the subjective wear trial showed no significant difference [5]. So this extended study aimed to determine the comfort properties by a wear trial in an extremely environment.

A study on the difference between two types of mountaineering outerwear in a cold, wet and windy environment