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Also known as atmosphere suit, vac suit, pressure suit, space armor, environment(al) suit, e-suit, EVA suit. Clarke said Current NASA suits look like baggy inflated coveralls with a large back pack and a spherical fishbowl over the head.
Disadvantage is they are monumentally overwhelmingly hideously encumbering like wearing a suit of medieval plate armor made out of solid lead. Semi-rigid space suits are a cross between soft and hard shell suits.
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.
It would be the outer-space equivalent of those stubborn elderly hospital patients who insist on smoking cigarettes while wearing oxygen tanks. NASA tolerates low-pressure pure-oxygen pressurization in their soft space suits because they have no choice.
There is not a lot of research, but NASA seems to think that if an astronaut in such a suit got punctured by a micro-meteor and it caught fire, the main hazard is a fire enlarging the diameter of the breach, an astronaut-shaped ball of flame.