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They are only used as a precaution, worn inside the habitat module during times when there is danger of it springing a leak (such as during lift-off).Full-(Body) Pressure-suits can be either Low-Pressure (pure oxygen at 32.4 k Pa) or High-Pressure (breathing mix at 101.3 k Pa, normal Terran atmospheric pressure).Currently most of NASA's space suits are soft suits. The advantage is they can be fully pressurized so no pre-breathing is required.They are also much more tear and puncture resistant than soft suits.Soft suits also take forever to put on, they fight your every movement (making EVA work very fatiguing), and if you tear the suit skin you will die horribly in about 90 seconds.When I say "fight your every movement" I mean "raise the energy expenditure to do a task by about 400%".For what it is worth, the "Apollo Operations Handbook Extravehicular Mobility Unit", Revision 5, Table 2-I quotes the maximum leak rate of 180 cubic centimeters per minute at 25.5 k Pa.
Which is a problem if an emergency strikes and you don't a few hours.
The accuracy of space suits in science fiction was very much hit or miss.
The low budget show Space Academy had "Life Support Bracelets" and the Star Trek Animated series had force-field based "Life Support Belts" as a cheapskate way to avoid the special effect expense of renting or drawing an actual space suit.
To avoid this the astronaut must do pre-breathing for a couple of hours.
If you go from a high-pressure habitat module into a high-pressure space suit the bends does not happen.
Disadvantage is they have to use low pressure so The Bends once again raises its ugly head.