Gail says – as in, humans and other fauna. But if my jacket self-breathes, it must therefore be alive, and ewwww. Ian rolls his eyes and says this handy term refers to the various microporous membranes that allow water vapour to escape but resist the entry of water droplets, the first (but by no means last) and arguably still best-known of which is Gore-Tex.

Fun facts about Gore-Tex manufacturer, W.L. Gore & Associates:

* Apollo 11 astronauts Neil Armstrong and ‘Buzz’ Aldrin installed seismographic equipment on the Moon in 1969. It was connected to the lunar lander with a lightweight cable made by Gore.

* The first two Gore-Tex products sold were a joint sealant for industrial pipes and a pipe thread tape.

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