I was concerned that they would not be able to go in both ears, but they did so without any issues, and they do not cause the ears to become tired. The surrounding environment can be heard; while this is not a problem for me (it is preferable to maintain some level of oversight over the goings-on in one's surroundings rather than entirely obstructing them), it may be for another person. When I press the headphones firmly into the auricle, I am able to fully block out any sound that is coming from the outside, but you won't walk like that.
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