I just tested it: 12 hours of flight ...

I just tested on: 12-hour flight in silence and comfort. I had a supra oriculaire Böse who compressait my ears after a few hours. QC25 headphones with this, there is no discomfort, and bluffing noise reduction. We do not even feel it when sleeping on the side. The battery case and are practical. Helmet well finished, very light, quality. The sound, as always with Böse is very good and the noise reduction to watch a movie, with 4 reactors on the wings, is impeccable.