Windproof pants are pants made of windproof fabrics. Windproof fabric refers to the fabric with windproof effect. These fabrics generally need coating or coating, or the fabric itself has a high density.
Wind-proof fabric permeability test to see the wind-proof effect of fabric. After coating or pasting, basically all fabrics can achieve windproof effect by this means, and can be completely airtight, that is, the permeability test is zero. So I know that the disadvantage of wearing windproof pants in winter is that they are airtight and inflexible.