Is there anything more dispiriting than buying a brand new waterproof jacket that promises to be highly breathable, then realizing when you're halfway up a steep trail that the inside is heavy with condensation?
You might assume that you've bought a faulty jacket, and even end up returning it, but the inconvenient truth is that brands have never been able to test how the microclimate of a fabric will generate condensation under real-life conditions – until now.
