A microporous membrane similar to Gore-Tex, Hyvent is a waterproof/breathable technology that is designed to keep bigger water droplets out and let smaller sweat vapor particles be dispersed to the outside.  Hyvent is very waterproof, but it suffers from some breathability issues; it’s noticeably stuffier when compared to Gore-Tex.  But, it’s not terribly expensive (one of The North Face’s entry-level Hyvent shells can be found for around $80), so, it’s kind of a case of you get what you pay for.

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