How two layer fabric is constructed
BUT HOW DO WE MAKE FABRIC WATERPROOF & BREATHABLE?
Our waterproof and breathable fabrics consist of an outer layer of nylon, and a laminated membrane of PTFE (expanded Polytetrafluoroethylene). The purpose of the first layer is to protect and look cool; it’s not waterproof but is treated with a DWR (Durable Water Repellent), so it doesn’t soak up water.
The heavy lifting is done by the membrane, which has tiny holes too small to let liquid water enter but large enough to allow water vapour (which is sweat from your body) to escape.
Our skin produces oil which is mixed with our sweat and anything else we have applied to our skin which has escaped. This causes the PTFE membranes to lose its ability to keep out water. To keep your garment working at its best, wash it. For many years we thought that by washing the garment, somehow it would lose its superpowers. No, by washing you are helping extend the life of the membrane.
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