GSh-6A 

 

The high altitude GSh-6 helmet was introduced in the early sixties to replace the GSh-4.
It consists of an inner cloth helmet which includes the communication system, and an aluminum shell.
The visor is electrically heated, oxygen is routed into the helmet by means of a perforated rubber pipe located around the visor, in order to avoid fogging.

 

It was used on many fighters of the era as the MiG-21/ 23 / 25, Su-15…