Sennheiser HD-26 Pro

These are hands down my favorite headphones!
I have been using the HD-25 for years. I have dropped them from 4m height, had cases with equipment run over them and they still work great after 20 years of use and most parts on them are replaceable!
The HD-26 have all the same qualities but with updated sound and construction that makes them even better.
Sure there are more transparent headphones out there like Grado GS1000 or Sennheiser HD800 but they will brake by just putting them in a bag!
And yes you can buy other closed headphones with noise cancelling, but they always sound a bit artificial sound and none of them have the punch and sheer power as the HD-26!
These headphone can play LOUD from any crappy phone or budget mixer desk you plug them into. They fold up nicely and they are perfect when you need a closed headphone as a DJ, sound engineer or for recording purposes. But they are also great as a nice closed headphone for long flights and even though they do not have noise cancelling they do a good job of isolating you from the outside world.