Suit worn in the open desert of the planet Arrakis that was designed to preserve the body's moisture. It consisted of various layers that would firstly absorb the body's moisture through sweating and urination, then filter the impurities so that drinkable water would be circulated to catchpockets. The individual could then drink the reclaimed water from a tube attached to the neck.
During the time of the Faufreluches, stillsuits were manufactured by Fremen as well as private enterpreneurs. However, Fremen manufactured stillsuits were widely considered the best, as they were the only ones that could preserve the body's moisture in the deep desert. Only an average of a thimbleful of water a day was lost when a Fremen stillsuit was worn.
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