Waterproof fabric technology has come a long way since its humble complicated chemical beginnings in Bob Gore’s laboratory. I’ll spare you the details of how intermolecular forces prevent water molecules from penetrating a porous membrane, or how polyurethane can be considered breathable due to solid-state diffusion (however if you’re like me and really want to know about this stuff, click here). What I will give you is a practical and detailed outdoor adventurer’s guide to understanding technical waterproof fabrics. ...
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