there is almost no noise leakage and they have great passive noise isolation.

These are over-the-ear headphones and they ISOLATE noise; they do not cancel noise

These don't cancel noise but isolation of noise is great

Nice snug fit that has passive noise canceling abilities

Compared with other brands, it is also pretty competitive but you have to consider that these do not have active noise cancellation- Noise cancellation/Sound leaking: As previously said, these come with passive noise cancellation, meaning no ultrasonic sound blocking external sounds, but thanks to that, it adds to a better clarity and no head aches

Does not offer any active noise cancellation (ANC), but has passive noise isolation that drowned out most ambient sounds, but still allows you to hear something loud/close by

The second pair has a constant static noise that over powers the right speaker

Clean sound is far less damaging to the ears than "dirty" sound with a lot of other static and background noises

Noise Isolation

It doesn't overemphasize bass as it does on the Beats, not overpriced like the Sennheiser or B&O, and provides enough noise isolation

I look forward to a pair with active noise cancelling since the passive noise cancelling is not the best, but you will be able to hear your surroundings if anything happens.

The earpads do a decent job blocking external sound but not as good as active noise cancelling headphones

I bought these to wear while working at my metal lathe - not exactly machine shop levels of noise since it's just me and one lathe, but some passive noise cancelling is important.

The passive noise cancelling is pretty great as well

The Plantronics have APTx, active noise cancelling, voice prompts, and longer battery life.

With music playing, the headphones block out outside noise well

there is almost no noise leakage and they have great passive noise isolation.