Item from Dune by Frank Herbert
A full-body suit that reclaims the wearer's moisture — sweat, breath, urine — recycling it into drinkable water. Without one, the desert kills in hours.
The stillsuit defines life on Arrakis. Wearing one is the first thing a character does before stepping outside; forgetting one is a death sentence. The suit imposes its own rhythm on movement — the nose plugs change how you breathe, the body glove changes how you move, the constant low-grade discomfort of sealed recycling systems becomes background noise that Fremen stop noticing and offworlders never do. A Fremen-fitted stillsuit reclaims 99.7% of body moisture. An offworld commercial model manages perhaps 85% — the difference represents survival versus slow dehydration. How someone wears their stillsuit tells a Fremen everything they need to know: properly sealed nose plugs and tight fit means desert competence; loose straps and open face mask means offworld fool who'll be dead by sundown. The suit smells like the wearer — trapped sweat, recycled fluids, the faint chemical tang of osmotic membranes doing their work. The drinking water it produces tastes flat and slightly metallic. It is, without exaggeration, the most important object on the planet.
A close-fitting suit of layered fabric in muted desert tones — tan, ochre, grey. The outer layer is a micro-sandwich of insulating material; the inner layers are a network of moisture-reclamation tubing and osmotic membranes. A face mask with nose plugs filters exhaled moisture. Catchpockets at the thighs collect recycled water, accessible through drinking tubes. A properly fitted stillsuit leaves only the eyes exposed. Fremen models are hand-fitted and maintained with religious care; offworld models are crude approximations.
Also known as: desert suit, Fremen stillsuit, body moisture suit