why is it said that the highly moisture-permeable and highly waterproof tpu waterproof and breathable membrane is "breathable"?

the tpu film is extruded and processed into a film, which is combined with the woven base fabric. this layer of tpu film acts as a barrier film that allows smooth breathing, that is, the moisture generated by the human body can be emitted, and any external the liquid cannot penetrate. this breathability extends the application of tpu to some new areas: sportswear, sanitary products, outerwear, medical clothing, protective clothing, etc. these products are required to be both comfortable and comfortable for the wearer and the wearer. an effective protective barrier is established between the environment. the moisture permeability of this breathable tpu film is 5 to 6 times that of ordinary tpu films.

the moisture permeability of tpu is higher than that of pvc. although moisture permeability was not the main reason why tpu entered textiles at that time, this characteristic was exactly what textiles hoped for. today, the moisture permeability of textiles has become very important, and tpu is still a good way to solve this problem.