As well as being waterproof the fabric is also windprood and breathable.
The microporous structure of the GORE-TEX membrane is what makes GORE-TEX fabrics durably waterproof. Each microscopic pore is about 20,000 times smaller than a drop of water, which means that external moisture - from rain to snow to that puddle you just stepped in - can't penetrate the membrane.
Shivering? It could be the windchill effect. This occurs when cold air penetrates your clothing, negatively affecting heat from your body's sensitive microclimate. To keep you comfortable and protected even in harsh conditions, the GORE-TEX membrane has been engineered to be durably windproof. Your product breathes, but wind stays out. 
A quarter of a cup at rest. 1 litre during heavy exertion. Nearly 4 litres during a world-class marathon. That's how much perspiration our bodies can release in an hour in the form of water vapour.
To prevent the discomfort caused by overheating or wet conductive heat loss, perspiration must evaporate so that it doesn't stay trapped inside your clothes, footwear or gloves. What makes GORE-TEX products so breathable? The pores in the GORE-TEX membrane are 700 times BIGGER than a water vapour molecule. Since water vapour can easily pass through the membrane, you remain comfortable and dry.
To prevent the discomfort caused by overheating or wet conductive heat loss, perspiration must evaporate so that it doesn't stay trapped inside your clothes, footwear or gloves. What makes GORE-TEX products so breathable? The pores in the GORE-TEX membrane are 700 times BIGGER than a water vapour molecule. Since water vapour can easily pass through the membrane, you remain comfortable and dry.
Rebecca.
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