GORE-TEX. For the past few decades this waterproofing membrane has been an industry yardstick, and for many trampers, nothing else will suffice.
What Gore-Tex does is well known, but what exactly is it? And is it truly the only option ‘guaranteed to keep you dry’, as the membrane’s promotions so famously state?
Gore-Tex owes its existence to Bob Gore, who developed a microporous membrane by expanding polytetrafluoroethylene (commonly known as Teflon). This membrane - referred to as ePTFE - was weatherproof, breathable, thin and flexible. It was ideal for weatherproof clothing and has been available in jackets and other garments since the 1970s.
Gore-Tex was a breakthrough development and for a long time it ruled the roost, but now several other microporous membranes exist: event, Entrant, Pertex, plus those developed…