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If they were at 1atm, they would have really bad mobility. As an experiment I'd inflate a tire to 1atm and try to bend/stretch it by hand.

AFAIK, space suits are not inflated, they are pressurized.

Mobility is done with mechanical joints, not sheer bending force of an inflated chamber.

They are semi-rigid (not hard shell) and kept to the minimum pressure allowed by human physiology (~0.3 atm, not 1 atm): https://en.wikipedia.org/wiki/Space_suit#Design_concepts