What are the quietest pilot headsets?

I am not a pilot but I'm looking for high quality noise reducing headphones. My understanding is that helicopter pilot headsets have significant noise reduction. I am willing to spend a decent amount on them. What would you advise if a pilot asked for a headset for a noisy aircraft?

Note that I don't mind if they are bulky, I don't care if they have top notch sound quality. I am looking for both active and passive noise blocking.