| Pressure | 3.7 psi / 25.5 kPa |
| Suit mass (1g) | 41.75 lb (system) |
| Life support (primary) | VCM umbilical / vehicle-fed purge |
| Life support (backup) | VCM backup bottle ~9 min |
| EVA duration | N/A |
| Program | Gemini |
| Agency | NASA |
| Manufacturer | David Clark + AiResearch |
| First use | 1965 |
| Status | Retired |
| Donning / entry | Rear-entry suit with add-on visor, thermal layers and chest pack |
First US EVA configuration; open-loop purge via 25 ft umbilical
First US EVA — Gemini IV 1965
High workload, poor body stabilization, glove effort, very limited productivity
"Suit performance cannot be separated from translation aids and workload planning"
Definitive negative lesson in integrated EVA human factors — still cited in modern EVA planning
First US EVA physically exhausting and low-productivity despite suit functioning
→ Suit capability and worksite design must be developed together, not sequentially
"Even a simple IVA suit needs water survival and cockpit visibility contingencies"
"Lunar EVA required not just survival but sustained human work capability"
"Endurance and traversal demands exposed the need for mobility, dust robustness, and rover integration"
