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By the Numbers: The New Breathability Gap in WPB Jackets and What the Breathability Tests Get Wrong
Testing 21 current waterproof-breathable jackets and fabrics reveals a widening performance gap between membrane types. Stephen Seeber compares new measurements with earlier results, explains how humidity and temperature influence moisture transport, and examines why common breathability tests can overstate hydrophilic membrane performance under the conditions backpackers encounter on the trail.
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