Zsh-7 is the model of the helmet and it's used with all modern Russian fighters. (Standard Russian issue). Even in Su35. First used in Mig 29 along with the older model of same top sight. Although looks cool but Zsh-7 is too heavy and uncomfortable as compared to other flight helmets.
And it's...
Nice! Indian made version of Russian Zsh-7APN helmet with Russian Zh-3YM-1 HMS. IAF upgraded their Bisons and added these Helmet mounted sights during late 90s - mid 2000s. This Zh-3YM-1 is usually equipped on MKI helmets. Bisons have Ukrainian Sura-K. Not sure if they are the same thing or not...