They have so-called "passive noise isolation", i.e. with the right attachment (there are 3 pairs available) they have very good sound isolation.
What they do not have is "active noise cancelling", i.e. no active noise suppression.
Here it has a detailed test report:
https://www.rtings.com/headphones...
They are my first stereo in-ear buds. I am satisfied with them so far.

Due to the good fit, there is almost no disturbing external noise.
But I couldn't do anything with the sound