It's basically a micro-sandwich—a high-efficiency filter and heat-exchange system. The skin-contact layer's porous. Perspiration passes through it, having cooled the body…near-normal evaporation process. The next two layers…include heat exchange filaments and salt precipitators. Salt's reclaimed. Motions of the body, especially breathing and some osmotic action provide the pumping force. Reclaimed water circulates to catchpockets from which you draw it through this tube in the clip at your neck…Urine and feces are processed in the thigh pads. In the open desert, you wear this filter across your face, this tube in the nostrils with these plugs to ensure a tight fit. Breathe in through the mouth filter, out through the nose tube. With a Fremen suit in good working order, you won't lose more than a thimbleful of moisture a day…"
"You are an apt pupil, none better, but I've warned you that not even in play do you let a man inside your guard with death in his hand."
"I guess I'm not in the mood for it today," Paul said.
"Mood?" Halleck's voice betrayed his outrage even through the shield's filtering. "What has mood to do with it? You fight when the necessity arises - no matter the mood! Mood's a thing for cattle or making love or playing the baliset. It's not for fighting."
"I'm sorry, Gurney."
"You're not sorry enough!"
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