SK-1 is an initialism of "Skafandr Kosmicheskiy" # 1 (Скафандр Космический = "spacesuit" or "diving suit for space") is a spacesuit that was developed specially for Yuri Gagarin. As such, it is the first spacesuit ever used. After his successful flight on the Vostok 1 spacecraft, spacesuits of the SK series were used for space flights of other cosmonauts on Vostok spacecraft, in which the cosmonauts would eject and land separately from module.
The SK-1 was used from 1961-1963.
Almost exactly the same as the SK-1 but designed for a woman, it was on June 16 through 19th in 1963 on Vostok 6.
Allowed ejections up to 8 km (26,000 ft).
Name: SK-1/SK-2 Spacesuit
Manufacturer: NPP Zvezda
Missions: Vostok 1 to Vostok 6
Function: Intra-vehicular activity (IVA) and Ejection
Operating Pressure: 270 to 300 hPa (3.9 to 4.4 psi)
Suit Weight: 20 kg (44 lb)
Primary Life Support: Vehicle Provided
Isaac Abramov & Ingemar Skoog (2003). Russian Spacesuits. Chichester, UK: Praxis Publishing Ltd. ISBN .