Fighter pilots are expected to eject out of their aircraft in case the aircraft is not recoverable. An ejection always involves risk. You never know where and in what awkward condition you will land. Your question of survival comes later only once your head is safe.
The helmet also serves to provide facilities for a sound proof radio communication, attachment for oxygen supply, attachment for night vision glasses(NVG) and in many aircraft, helmet mounted display is also provided so that the pilot need not divert his attention frequently towards instrument panel.
few more details in following sliders,
Why do fighter pilots wear a helmet? 9/9
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why?
Fighter pilots are expected to eject out of their aircraft in case the aircraft is not recoverable. An ejection always involves risk. 
An ejection always involves risk.
Fighter pilots are expected to eject out of their aircraft in case the aircraft is not recoverable. An ejection always involves risk. 
First save Pilot head:
Your question of survival comes later only once your head is safe. Immediately after ejection the broken pieces of canopy might also hit your face. 
Additional Benifits
The helmet also serves to provide facilities for a sound proof radio communication, attachment for oxygen supply, attachment for night vision glasses(NVG) and in many aircraft, helmet mounted display is also provided so that the pilot need not divert his attention frequently towards instrument panel.
Full view of pilot with helmet and Uniform
pilot helmet will be look like this in full view, when he / she wear that
How It is working?
when pilot press eject button, pilot will be lifted by thruster engine, which fixed under pilot seat. Then he/she will be land safely using parachute.
Most advanced Helmet
EXCL BY WILLETTS BRITISH boffins have built the world¿s ¿most advanced¿ fighter jet helmet - capable of colour coding enemy targets. The ¿250,000 Striker II helmet has been designed for Typhoon war jet pilots and boasts in-built digital night vision and the ability to assign colour symbols to enemy targets. Before Striker II flying aces saw everything in monochrome green. One of the team behind Striker II, Chris Colston, of BAE Systems, said: ¿For the pilot it is like going from your old analogue TV to HD TV. ¿It is the most advanced fighter jet helmet in the world. ¿Before, everything was displayed in monochrome green. For the first time, we can now mark ground and air targets by colour, making them easier to identify at speed."
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