Awesome headphones. I love these guys and have been using them for about 6 months now. Their sound is impeccable, and are extremely comfortable, I wear them while studying I mean like 8-10 hours a day, and never really notice them. I wouldn't say that these are actually noise cancelling via electrical interference, its more via sound muffling than anything, but don't misinterpret, with the sound at a medium volume you will kill all but the loudest ambient noise. I highly recommend these. Flat out the best $20 I have EVER spent.