High-performance breathable, waterproof textiles found in clothing make outdoor activities more enjoyable. The secret to this high-tech textile is expanded polytet-rafluoroethylene (ePTFE) invented by Wilbert and Robert Gore1. The microporous structure of an expanded polytetrafluoroethylene membrane is able to resist large drops of water, while allowing water vapor to pass through, therefore making it both waterproof, yet breathable. As ePTFE is fragile on its own, it is used in conjunction with other materials to give the membrane structure.
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