| Pressure | 400 hPa |
| Suit mass (1g) | TBD |
| Life support (primary) | Open-loop backpack KP-55 oxygen |
| Life support (backup) | Airlock backup feed |
| EVA duration | N/A |
| Program | Voskhod-2 |
| Agency | Soviet Space Program |
| Manufacturer | Zvezda |
| First use | 1965 |
| Status | Retired |
| Donning / entry | Soft EVA with dual-bladder construction and backpack |
Double bladder; KP-55 backpack; world's first human spacewalk hardware
World's first EVA — Alexei Leonov, Voskhod-2, March 1965
Suit ballooning under pressure; airlock re-entry critically difficult — Leonov had to partially deflate the suit to re-enter
"Pressurized mobility and re-entry-to-airlock recovery must be a top-level requirement, not an afterthought"
First EVA suit ever built. Ingress difficulty under pressure became Requirement 1 for every subsequent EVA design worldwide
Suit inflation during Leonov's EVA made movement and airlock re-entry critically difficult — Leonov had to partially deflate to re-enter
→ Make ingress/egress and self-rescue a separate verification gate from EVA capability itself
"Shows value of integrated survival architecture and the penalty of long-duration IVA wear in a rigidly seated posture"
"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"
