A few weeks back I tested the Sony MDR-NC22 in-ear noise canceling headsets in my ears for around 40 hours over an 82 hour period and not only were the headsets comfortable but the noise canceling was also quite good.
If you'd like to checkout my detailed review on the Sony MDR-NC22 check out this link:
http://flyingwithfish.blogspot.com/2...ity-noise.html
Happy Flying!