Patent ID: 7488696

Claim:
An air-permeable composite fabric comprising: a first fabric layer; a second fabric layer; and an intermediate, air-permeable vapor barrier disposed between and bonded to said first fabric layer and said second fabric layer; said intermediate, air-permeable barrier layer being selected from the group consisting of: a foamed adhesive in the form of a discontinuous film, an adhesive in the form of a continuous film mechanically altered by stretching, and a membrane disposed between and adhered to said first fabric layer and said second fabric layer with an adhesive and mechanically altered by stretching, said intermediate, air-permeable vapor barrier layer having a level of air permeability to allow air flow between said first fabric layer and said second fabric layer, and said intermediate, air-permeable vapor barrier layer having a variable level of water vapor diffusion resistance that substantially decreases as air speed of moving air impinging on said composite fabric increases.