Clearedtoreenter, I've own a couple of excellent David Clark PNR headsets that did block a lot of the noise, I've found that the trade off though is that the clamping force is a lot higher to get that effect and therefore with long sorties become very uncomfortable and downright painful. I remember trading from my DC H10-60s, excellent headset but anything more than 3hrs became a bit painful, the change to my Zulu2s was incredible and never looked back
