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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.
Hard shell space suits advantages are: they can use high pressure atmo so you can't get the bends, you don't need to pre-breathe, and you'd need a freaking handgun to puncture it.
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.
The problem is if you go from a high-pressure environment (like a habitat module) into a low-pressure environment (like a low-pressure space suit) you run the risk of the bends.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.Often in old illustrations there are accordion bellows at the joints.Most space suits are Full (Body) Pressure-suits: they offer pressurization of the entire body in space for extended periods.Partial (Body) Pressure-suits only pressurize certain parts of the body for a limited time.