Waterproof breathable membrane technology was first introduced in the United States and Europe beginning, but the production process a wide variety of domestic products, all manufacturers of products of varying quality, failed to form a unified quality standards. In fact, there are three main waterproof breathable membrane configured: PP spunbond polypropylene film, breathable polymer film, PP spunbond polypropylene film. Spunbond polypropylene film role was mainly to enhance the tension and hydrostatic pressure and protective intermediate layer (breathable film), really breathable mainly by the intermediate layer polymer permeable membrane.