An elastic, waterproof polyurethane coating made by Toray Industries of Japan, licensed to numerous manufacturers under various names, such as Patagonia'sH2No and Helly-Hansen'sHelly-Tech.
An elastic coat of polyurethane that breathes through microscopic holes. The thicker the coat of entrant - the more waterproof and less breathable the garment becomes. Licensed for flexible winter fowl weather gear like rain jackets and gloves.