stillsuits

A stillsuit is a fictional device described in Frank Herbert's Dune series. It is designed to recycle and reclaim nearly all of the body's water waste. The suit is a complex, form-fitting garment that includes a series of filters, pumps, and tubes. These components capture moisture from the wearer's breath, sweat, and urine. The captured water is then purified and returned to the wearer for drinking.

The stillsuit is essential for survival in the harsh desert environment of the planet Arrakis, where water is extremely scarce. The technology is so advanced that a person wearing a stillsuit can survive for extended periods with minimal external water sources. The suits are also designed to protect the wearer from the arid climate by minimizing water loss through evaporation.

Key features of a stillsuit include a face mask with a breathing filter, a nose plug to prevent water loss from the nose, and a special rectal valve that reclaims water from feces. The inner lining of the suit is permeable, allowing sweat and urine to be absorbed and channeled to the suit's filtration system. The purified water is stored in a reservoir within the suit, from which the wearer can drink through a tube. The design emphasizes efficiency and resource conservation, making it a critical piece of equipment for the Fremen, the native inhabitants of Arrakis.