Bose has launched the latest generation of its QuietComfort line of headphones. The OEM asserts that these new 45s live up to their name with a "lightweight" design, not to mention "world-class" Acoustic Noise Cancelling technology. The new Bluetooth 5.1 accessories will be released in September 2021.
https://www.notebookcheck.net/Bose-claims-the-latest-QuietComfort-45-headphones-come-with-world-beating-ANC-24-hour-battery-life-and-high-fidelity-audio.557844.0.html
There is only one way to know how good the ANC is and I have yet to see the ANC graph, how much it cancel at each frequency if used simulated environment of multiple noisy locations.
I do have expectations though, sony's xm4 is more like xm3+, but still good enough, it needs better competition.