Modern gore Tex (and similar) shell jackets often are marketed as being 2 or sometimes 3 layer construction with the Gore Tex membrane being one of the layers. Often the outer layer isn’t actually waterproof and can soak through. If gore Tex is the main functional layer why does there have to be extra material layers facing the elements?
In: Engineering
GoreTex wears off and needs replacing after a while. Having a layer on top protects it, allowing it to last longer. It also means that if it gets a tear, it’s less likely to damage the waterproof layer.
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