Assertion: raincoat | /r/CapableOf | fail strict hydrostatic head test
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Source sentences:
text: These are directional fabrics such as Nikwax Analogy and FurTech, which are also breathable in the conventional sense (although these examples are actually a combination of two different fabrics, a directional "pump" layer underneath a distinct windproof and water resistant outer layer, and while effectively completely waterproof against rain they would fail a strict hydrostatic head test as given in the definition above).