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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%".
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).
Suits can be Soft, Hard-shell, Semi-Rigid/Hybrid or Skintight. This means they cannot be pressurized to the same level as the inside of the habitat module or the space suited person will be forced into a posture like a star-fish and be unable to bend any joints.Low pressure means you have to do a few hours of pre-breathing or the suit will kill you with The Bends.Which is a problem if an emergency strikes and you don't a few hours.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.