"Noise isolation" refers to blocking out external sounds or unwanted distractions, allowing you to focus or enjoy music without interruptions. Full definition
With outstanding comfort and excellent passive noise isolation, you get the most out of every note, and you can also lower the volume for less ear strain. (digitaltrends.com)
They do such a great job of noise isolation without shutting the world out completely. (techwelike.com)
These headphones go over the ear and are ideal for noise isolation. (heavy.com)