One of the best noise cancelling on ear headphones I have used - could not travel without these. They are the old model (PXC 250 II out now) but there is not much which I can find which compares for this price
Sennheiser PXC 250 Active Noise Canceling Headphones (Reconditioned)
Recommended Retail Price (RRP) - $299.95 as of June 2015 based on a new product. (although I believe this is relates to the PXC 250 II which is $229 @ OW)
FEATURES
Fold & Flip Design Allows The Ear Cups To Be Turned Through 90°
Fold The Headphones Closed
1.8 M Kevlar-Reinforced Ofc
Copper Cable with 3.5Mm Jack Plug
When engaged, NoiseGard active noise reduction drops steady-state low-frequency noise (from about 500 Hz and below) by 15 dB—which the human ear perceives as more than halving the noise—thus enhancing the clarity of your music. The noise reduction circuit requires 2 AAA batteries (not included), but the headphones work fine without the circuit engaged.
Sennheiser's fold and flip design lets you turn the ear pieces 90 degrees and fold the headphones closed. Their ported design lets them move more air for greater bass response.
Refurbished?