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     Guaranteed
                Waterproof
                           Windproof
                                     Breathable
                                               Protection!

Sympatex is a lightweight, ultra-thin, non-porous polyester film that is totally waterproof, totally windproof, yet highly breathable.

In order to achieve its unique balance of waterproof breathability, Sympatex uses both chemistry and physics to its advantage. Since it is a solid, non-porous film, Sympatex is impervious to water. What makes Sympatex unique are the hydrophilic (water-loving) molecular zones that have been built into the membrane. When perspiration takes place on the inside of the garment, it begins to evaporate. Since the temperature and humidity inside an article of clothing are higher than on the outside, there is a driving force from inside to the outside. The free-floating moisture vapor molecules from perspiration are driven through the hydrophilic zones in the Sympatex membrane to the outside of the garment where they can evaporate, leaving the inside dry and comfortable.