A moisture vapor permeable, substantially liquid impermeable composite sheet material comprising a fibrous substrate and a moisture vapor permeable thermoplastic film layer. The moisture vapor permeable film has an average thickness of less than 25 microns, a peel strength of at least 0.1 N/cm, a dynamic...http://www.google.com.au/patents/US6187696?utm_source=gb-gplus-sharePatent US6187696 - Breathable composite sheet structure
