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"Hazmat suits to protect against biological and chemical attacks are often made of thick, synthetic rubber that's impervious to the nastiest toxins. But they're also impervious to sweat, and people wearing them can typically only work for short periods before succumbing to exhaustion, heat stroke and, occasionally, death." The new suit that is being created will let the wearers seat out to help cool them inside the thick rubber suit. You can read more at the original article.