Introduced in the late '50, it was used for high-altitude flights, between others, in Mig-19, MiG-21 and SU-15 fighters.
Composed by an inner cloth communication helmet and an external aluminium shell with a surgical rubber sealing hood, this helmet had a heated visor.
The visor hooks at the top and latches at the bottom. It was
worn with a VKK-3/4/6 partial pressure suit.