One is to use tightly woven pure cotton fabric. When the surface of the fabric is wet, the cotton fibers absorb water and swell, reducing the pores in the fabric and making it waterproof;</p
The second is to use a waterproof and breathable film with a microporous structure, taking advantage of the fact that the size of the micropores is much smaller than the size of raindrops but larger than the diameter of water vapor, so that raindrops cannot penetrate, but water vapor can be emitted, achieving waterproofing and breathability, but the process is complex and costly high;</p
The third is to use a non-porous, hydrophilic polyurethane coating. The coating has a waterproof effect, while chemically modified polyurethane is hydrophilic, allowing water vapor to diffuse in the coating to allow moisture permeability. There are many assault suits on the market. Is polyurethane coated fabric �另外，为增强透气性，有的服装还会在腋下部位使用拉链、网布、气孔等�
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