| Pressure | 300 hPa |
| Suit mass (1g) | TBD |
| Life support (primary) | Vehicle-supported open-loop + post-ejection oxygen |
| Life support (backup) | Emergency oxygen |
| EVA duration | N/A |
| Program | Vostok |
| Agency | Soviet Space Program |
| Manufacturer | Zvezda |
| First use | 1961 |
| Status | Retired |
| Donning / entry | Soft full-pressure, custom fitted |
Maskless ventilation; automatic visor closure; flotation collar; integrated ejection/landing logic
Vostok crew rescue — nominal IVA
Long seated wear uncomfortable; waste-handling awkward; appendix tie-off burden
"Shows value of integrated survival architecture and the penalty of long-duration IVA wear in a rigidly seated posture"
Gagarin's suit. SK-2 adapted for Tereshkova — gender-inclusive sizing must be day-one, not an afterthought
"Pressurized mobility and re-entry-to-airlock recovery must be a top-level requirement, not an afterthought"
"Rear-entry and semi-rigid architecture remain highly relevant for surface systems and suitport concepts"
"Keep rescue-suit platforms on a managed block-upgrade path instead of deferring subsystem refresh for decades"
